To repeat briefly;—we
remember best our last few performances of any given kind, and
our present performance is most likely to resemble one or other
of these; we only remember our earlier performances by way of
residuum; nevertheless, at times, some older feature is liable to
reappear.
We take our steps in the same order on each successive
occasion, and are for the most part incapable of changing that
order.
The introduction of slightly new elements into our manner is
attended with benefit; the new can be fused with the old, and the
monotony of our action is relieved. But if the new element
is too foreign, we cannot fuse the old and new—nature
seeming equally to hate too wide a deviation from our ordinary
practice, and no deviation at all. Or, in plain
English—if any one gives us a new idea which is not too far
ahead of us, such an idea is often of great service to us, and
may give new life to our work—in fact, we soon go back,
unless we more or less frequently come into contact with new
ideas, and are capable of understanding and making use of them;
if; on the other hand, they are too new, and too little led up
to, so that we find them too strange and hard to be able to
understand them and adopt them, then they put us out, with every
degree of completeness—from simply causing us to fail in
this or that particular part, to rendering us incapable of even
trying to do our work at all, from pure despair of
succeeding.
It requires many repetitions to fix an impression firmly; but
when it is fixed, we cease to have much recollection of the
manner in which it came to be so, or of any single and particular
recurrence.
Our memory is mainly called into action by force of
association and similarity in the surroundings. We want to
go on doing what we did when we were last as we are now, and we
forget what we did in the meantime.
These rules, however, are liable to many exceptions; as for
example, that a single and apparently not very extraordinary
occurrence may sometimes produce a lasting impression, and be
liable to return with sudden force at some distant time, and then
to go on returning to us at intervals. Some incidents, in
fact, we know not how nor why, dwell with us much longer than
others which were apparently quite as noteworthy or perhaps more
so.
Now I submit that if the above observations are just, and if,
also, the offspring, after having become a new and separate
personality, yet retains so much of the old identity of which it
was once indisputably part, that it remembers what it did when it
was part of that identity as soon as it finds itself in
circumstances which are calculated to refresh its memory owing to
their similarity to certain antecedent ones, then we should
expect to find:—
I. That offspring should, as a general rule, resemble
its own most immediate progenitors; that is to say, that it
should remember best what it has been doing most recently.
The memory being a fusion of its recollections of what it did,
both when it was its father and also when it was its mother, the
offspring should have a very common tendency to resemble both
parents, the one in some respects, and the other in others; but
it might also hardly less commonly show a more marked
recollection of the one history than of the other, thus more
distinctly resembling one parent than the other. And this
is what we observe to be the case. Not only so far as that
the offspring is almost invariably either male or female, and
generally resembles rather the one parent than the other, but
also that in spite of such preponderance of one set of
recollections, the sexual characters and instincts of the
opposite sex appear, whether in male or female, though
undeveloped and incapable of development except by abnormal
treatment, such as has occasionally caused milk to be developed
in the mammary glands of males; or by mutilation, or failure of
sexual instinct through age, upon which, male characteristics
frequently appear in the females of any species.
Brothers and sisters, each giving their own version of the
same story, though in different words, should resemble each other
more closely than more distant relations. This too we
see.
But it should frequently happen that offspring should resemble
its penultimate rather than its latest phase, and should thus be
more like a grand-parent than a parent; for we observe that we
very often repeat a performance in a manner resembling that of
some earlier, but still recent, repetition; rather than on the
precise lines of our very last performance. First-cousins
may in this case resemble each other more closely than brothers
and sisters.
More especially, we should not expect very successful men to
be fathers of particularly gifted children; for the best men are,
as it were, the happy thoughts and successes of the
race—nature’s “flukes,” so to speak, in
her onward progress. No creature can repeat at will, and
immediately, its highest flight. It needs repose. The
generations are the essays of any given race towards the highest
ideal which it is as yet able to see ahead of itself, and this,
in the nature of things, cannot be very far; so that we should
expect to see success followed by more or less failure, and
failure by success—a very successful creature being a
great “fluke.” And this is what we
find.
In its earlier stages the embryo should be simply conscious of
a general method of procedure on the part of its forefathers, and
should, by reason of long practice, compress tedious and
complicated histories into a very narrow compass, remembering no
single performance in particular. For we observe this in
nature, both as regards the sleight-of-hand which practice gives
to those who are thoroughly familiar with their business, and
also as regards the fusion of remoter memories into a general
residuum.
II. We should expect to find that the offspring, whether
in its embryonic condition, or in any stage of development till
it has reached maturity, should adopt nearly the same order in
going through all its various stages. There should be such
slight variations as are inseparable from the repetition of any
performance by a living being (as contrasted with a machine), but
no more. And this is what actually happens. A man may
cut his wisdom-teeth a little later than he gets his beard and
whiskers, or a little earlier; but on the whole, he adheres to
his usual order, and is completely set off his balance, and upset
in his performance, if that order be interfered with
suddenly. It is, however, likely that gradual modifications
of order have been made and then adhered to.
After any animal has reached the period at which it ordinarily
begins to continue its race, we should expect that it should show
little further power of development, or, at any rate, that few
great changes of structure or fresh features should appear; for
we cannot suppose offspring to remember anything that happens to
the parent subsequently to the parent’s ceasing to contain
the offspring within itself; from the average age, therefore, of
reproduction, offspring would cease to have any further
experience on which to fall back, and would thus continue to make
the best use of what it already knew, till memory failing either
in one part or another, the organism would begin to decay.
To this cause must be referred the phenomena of old age, which
interesting subject I am unable to pursue within the limits of
this volume.
Those creatures who are longest in reaching maturity might be
expected also to be the longest lived; I am not certain, however,
how far what is called alternate generation militates against
this view, but I do not think it does so seriously.
Lateness of marriage, provided the constitution of the
individuals marrying is in no respect impaired, should also tend
to longevity.
I believe that all the above will be found sufficiently well
supported by facts. If so, when we feel that we are getting
old we should try and give our cells such treatment as they will
find it most easy to understand, through their experience of
their own individual life, which, however, can only guide them
inferentially, and to a very small extent; and throughout life we
should remember the important bearing which memory has upon
health, and both occasionally cross the memories of our component
cells with slightly new experiences, and be careful not to put
them either suddenly or for long together into conditions which
they will not be able to understand. Nothing is so likely
to make our cells forget themselves, as neglect of one or other
of these considerations. They will either fail to recognise
themselves completely, in which case we shall die; or they will
go on strike, more or less seriously as the case may be, or
perhaps, rather, they will try and remember their usual course,
and fail; they will therefore try some other, and will probably
make a mess of it, as people generally do when they try to do
things which they do not understand, unless indeed they have very
exceptional capacity.
It also follows that when we are ill, our cells being in such
or such a state of mind, and inclined to hold a corresponding
opinion with more or less unreasoning violence, should not be
puzzled more than they are puzzled already, by being contradicted
too suddenly; for they will not be in a frame of mind which can
understand the position of an open opponent: they should
therefore either be let alone, if possible, without notice other
than dignified silence, till their spleen is over, and till they
have remembered themselves; or they should be reasoned with as by
one who agrees with them, and who is anxious to see things as far
as possible from their own point of view. And this is how
experience teaches that we must deal with monomaniacs, whom we
simply infuriate by contradiction, but whose delusion we can
sometimes persuade to hang itself if we but give it sufficient
rope. All which has its bearing upon politics, too, at much
sacrifice, it may be, of political principles, but a politician
who cannot see principles where principle-mongers fail to see
them, is a dangerous person.
I may say, in passing, that the reason why a small wound
heals, and leaves no scar, while a larger one leaves a mark which
is more or less permanent, may be looked for in the fact that
when the wound is only small, the damaged cells are snubbed, so
to speak, by the vast majority of the unhurt cells in their own
neighbourhood. When the wound is more serious they can
stick to it, and bear each other out that they were hurt.
III. We should expect to find a predominance of sexual
over asexual generation, in the arrangements of nature for
continuing her various species, inasmuch as two heads are better
than one, and a locus pœnitentiæ is thus given
to the embryo—an opportunity of correcting the experience
of one parent by that of the other. And this is what the
more intelligent embryos may be supposed to do; for there would
seem little reason to doubt that there are clever embryos and
stupid embryos, with better or worse memories, as the case may
be, of how they dealt with their protoplasm before, and better or
worse able to see how they can do better now; and that embryos
differ as widely in intellectual and moral capacity, and in a
general sense of the fitness of things, and of what will look
well into the bargain, as those larger embryos—to wit,
children—do. Indeed it would seem probable that all
our mental powers must go through a quasi-embryological
condition, much as the power of keeping, and wisely spending,
money must do so, and that all the qualities of human thought and
character are to be found in the embryo.
Those who have observed at what an early age differences of
intellect and temper show themselves in the young, for example,
of cats and dogs, will find it difficult to doubt that from the
very moment of impregnation, and onward, there has been a
corresponding difference in the embryo—and that of six
unborn puppies, one, we will say, has been throughout the whole
process of development more sensible and better looking—a
nicer embryo, in fact—than the others.
IV. We should expect to find that all species, whether
of plants or animals, are occasionally benefited by a cross; but
we should also expect that a cross should have a tendency to
introduce a disturbing element, if it be too wide, inasmuch as
the offspring would be pulled hither and thither by two
conflicting memories or advices, much as though a number of
people speaking at once were without previous warning to advise
an unhappy performer to vary his ordinary performance—one
set of people telling him he has always hitherto done thus, and
the other saying no less loudly that he did it thus;—and he
were suddenly to become convinced that they each spoke the
truth. In such a case he will either completely break down,
if the advice be too conflicting, or if it be less conflicting,
he may yet be so exhausted by the one supreme effort of fusing
these experiences that he will never be able to perform again; or
if the conflict of experience be not great enough to produce such
a permanent effect as this, it will yet, if it be at all serious,
probably damage his performances on their next several occasions,
through his inability to fuse the experiences into a harmonious
whole, or, in other words, to understand the ideas which are
prescribed to him; for to fuse is only to understand.
And this is absolutely what we find in fact. Mr. Darwin
writes concerning hybrids and first crosses:—“The
male element may reach the female element, but be incapable of
causing an embryo to be developed, as seems to have been the case
with some of Thuret’s experiments on Fuci. No
explanation can be given of these facts any more than why certain
trees cannot be grafted on others.”
I submit that what I have written above supplies a very fair
primâ facie explanation.
Mr. Darwin continues:—
“Lastly, an embryo may be developed, and then perish at
an early period. This latter alternative has not been
sufficiently attended to; but I believe, from observations
communicated to me by Mr. Hewitt, who has had great experience in
hybridising pheasants and fowls, that the early death of the
embryo is a very frequent cause of sterility in first
crosses. Mr. Salter has recently given the results of an
examination of about five hundred eggs produced from various
crosses between three species of Gallus and their hybrids; the
majority of these eggs had been fertilised; and in the majority
of the fertilised eggs, the embryos had either been partially
developed, and had then perished, or had become nearly mature,
but the young chickens had been unable to break through the
shell. Of the chickens which were born more than
four-fifths died within the first few days, or at latest weeks,
‘without any obvious cause, apparently from mere inability
to live,’ so that from the five hundred eggs only twelve
chickens were reared” (“Origin of Species,”
249, ed. 1876).
No wonder the poor creatures died, distracted as they were by
the internal tumult of conflicting memories. But they must
have suffered greatly; and the Society for the Prevention of
Cruelty to Animals may perhaps think it worth while to keep an
eye even on the embryos of hybrids and first crosses. Five
hundred creatures puzzled to death is not a pleasant subject for
contemplation. Ten or a dozen should, I think, be
sufficient for the future.
As regards plants, we read:—
“Hybridised embryos probably often perish in like manner
. . . of which fact Max Wichura has given some striking cases
with hybrid willows . . . It may be here worth noticing, that in
some cases of parthenogenesis, the embryos within the eggs of
silk moths, which have not been fertilised, pass through their
early stages of development, and then perish like the embryos
produced by a cross between distinct species”
(Ibid).
This last fact would at first sight seem to make against me,
but we must consider that the presence of a double memory,
provided it be not too conflicting, would be a part of the
experience of the silk moth’s egg, which might be then as
fatally puzzled by the monotony of a single memory as it would be
by two memories which were not sufficiently like each
other. So that failure here must be referred to the utter
absence of that little internal stimulant of slightly conflicting
memory which the creature has always hitherto experienced, and
without which it fails to recognise itself. In either case,
then, whether with hybrids or in cases of parthenogenesis, the
early death of the embryo is due to inability to recollect, owing
to a fault in the chain of associated ideas. All the facts
here given are an excellent illustration of the principle,
elsewhere insisted upon by Mr. Darwin, that any great and
sudden change of surroundings has a tendency to induce sterility;
on which head he writes (“Plants and Animals under
Domestication,” vol. ii. p. 143, ed. 1875):—
“It would appear that any change in the habits of life,
whatever their habits may be, if great enough, tends to affect in
an inexplicable manner the powers of reproduction.”
And again on the next page:—
“Finally, we must conclude, limited though the
conclusion is, that changed conditions of life have an especial
power of acting injuriously on the reproductive system. The
whole case is quite peculiar, for these organs, though not
diseased, are thus rendered incapable of performing their proper
functions, or perform them imperfectly.”
One is inclined to doubt whether the blame may not rest with
the inability on the part of the creature reproduced to recognise
the new surroundings, and hence with its failing to know
itself. And this seems to be in some measure
supported—but not in such a manner as I can hold to be
quite satisfactory—by the continuation of the passage in
the “Origin of Species,” from which I have just been
quoting—for Mr. Darwin goes on to say:—
“Hybrids, however, are differently circumstanced before
and after birth. When born, and living in a country where
their parents live, they are generally placed under suitable
conditions of life. But a hybrid partakes of only half of
the nature and condition of its mother; it may therefore before
birth, as long as it is nourished within its mother’s womb,
or within the egg or seed produced by its mother, be exposed to
conditions in some degree unsuitable, and consequently be liable
to perish at an early period . . . ” After which,
however, the conclusion arrived at is, that, “after all,
the cause more probably lies in some imperfection in the original
act of impregnation, causing the embryo to be imperfectly
developed rather than in the conditions to which it is
subsequently exposed.” A conclusion which I am not
prepared to accept.
Returning to my second alternative, that is to say, to the
case of hybrids which are born well developed and healthy, but
nevertheless perfectly sterile, it is less obvious why, having
succeeded in understanding the conflicting memories of their
parents, they should fail to produce offspring; but I do not
think the reader will feel surprised that this should be the
case. The following anecdote, true or false, may not be out
of place here:—
“Plutarch tells us of a magpie, belonging to a barber at
Rome, which could imitate to a nicety almost every word it
heard. Some trumpets happened one day to be sounded before
the shop, and for a day or two afterwards the magpie was quite
mute, and seemed pensive and melancholy. All who knew it
were greatly surprised at its silence; and it was supposed that
the sound of the trumpets had so stunned it as to deprive it at
once of both voice and hearing. It soon appeared, however,
that this was far from being the case; for, says Plutarch, the
bird had been all the time occupied in profound meditation,
studying how to imitate the sound of the trumpets; and when at
last master of it, the magpie, to the astonishment of all its
friends, suddenly broke its long silence by a perfect imitation
of the flourish of trumpets it had heard, observing with the
greatest exactness all the repetitions, stops, and changes.
The acquisition of this lesson had, however,
exhausted the whole of the magpie’s stock of
intellect, for it made it forget everything it had learned
before” (“Percy Anecdotes,” Instinct, p.
166).
Or, perhaps, more seriously, the memory of every impregnate
ovum from which every ancestor of a mule, for example, has
sprung, has reverted to a very long period of time during which
its forefathers have been creatures like that which it is itself
now going to become: thus, the impregnate ovum from which the
mule’s father was developed remembered nothing but horse
memories; but it felt its faith in these supported by the
recollection of a vast number of previous generations, in
which it was, to all intents and purposes, what it now is.
In like manner, the impregnate ovum from which the mule’s
mother was developed would be backed by the assurance that it had
done what it is going to do now a hundred thousand times
already. All would thus be plain sailing. A horse and
a donkey would result. These two are brought together; an
impregnate ovum is produced which finds an unusual conflict of
memory between the two lines of its ancestors, nevertheless,
being accustomed to some conflict, it manages to get over
the difficulty, as on either side it finds itself backed by a
very long series of sufficiently steady memory. A mule
results—a creature so distinctly different from either
horse or donkey, that reproduction is baffled, owing to the
creature’s having nothing but its own knowledge of itself
to fall back upon, behind which there comes an immediate
dislocation, or fault of memory, which is sufficient to bar
identity, and hence reproduction, by rendering too severe an
appeal to reason necessary—for no creature can reproduce
itself on the shallow foundation which reason can alone
give. Ordinarily, therefore, the hybrid, or the
spermatozoon or ovum, which it may throw off (as the case may
be), finds one single experience too small to give it the
necessary faith, on the strength of which even to try to
reproduce itself. In other cases the hybrid itself has
failed to be developed; in others the hybrid, or first cross, is
almost fertile; in others it is fertile, but produces depraved
issue. The result will vary with the capacities of the
creatures crossed, and the amount of conflict between their
several experiences.
The above view would remove all difficulties out of the way of
evolution, in so far as the sterility of hybrids is
concerned. For it would thus appear that this sterility has
nothing to do with any supposed immutable or fixed limits of
species, but results simply from the same principle which
prevents old friends, no matter how intimate in youth, from
returning to their old intimacy after a lapse of years, during
which they have been subjected to widely different influences,
inasmuch as they will each have contracted new habits, and have
got into new ways, which they do not like now to alter.
We should expect that our domesticated plants and animals
should vary most, inasmuch as these have been subjected to
changed conditions which would disturb the memory, and, breaking
the chain of recollection, through failure of some one or other
of the associated ideas, would thus directly and most markedly
affect the reproductive system. Every reader of Mr. Darwin
will know that this is what actually happens, and also that when
once a plant or animal begins to vary, it will probably vary a
good deal further; which, again, is what we should
expect—the disturbance of the memory introducing a fresh
factor of disturbance, which has to be dealt with by the
offspring as it best may. Mr. Darwin writes: “All our
domesticated productions, with the rarest exceptions, vary far
more than natural species” (“Plants and
Animals,” &c., vol. ii. p. 241, ed. 1875).
On my third supposition, i.e., when the difference
between parents has not been great enough to baffle reproduction
on the part of the first cross, but when the histories of the
father and mother have been, nevertheless, widely
different—as in the case of Europeans and Indians—we
should expect to have a race of offspring who should seem to be
quite clear only about those points, on which their progenitors
on both sides were in accord before the manifold divergencies in
their experiences commenced; that is to say, the offspring should
show a tendency to revert to an early savage condition.
That this indeed occurs may be seen from Mr. Darwin’s
“Plants and Animals under Domestication” (vol. ii. p.
21, ed. 1875), where we find that travellers in all parts of the
world have frequently remarked “on the degraded state
and savage condition of crossed races of man.” A
few lines lower down Mr. Darwin tells us that he was himself
“struck with the fact that, in South America, men of
complicated descent between Negroes, Indians, and Spaniards
seldom had, whatever the cause might be, a good
expression.” “Livingstone” (continues Mr.
Darwin) “remarks, ‘It is unaccountable why
half-castes are so much more cruel than the Portuguese, but such
is undoubtedly the case.’ An inhabitant remarked to
Livingstone, ‘God made white men, and God made black men,
but the devil made half-castes.’” A little
further on Mr. Darwin says that we may “perhaps infer that
the degraded state of so many half-castes is in part due to
reversion to a primitive and savage condition, induced by
the act of crossing, even if mainly due to the unfavourable
moral conditions under which they are generally
reared.” Why the crossing should produce this
particular tendency would seem to be intelligible enough, if the
fashion and instincts of offspring are, in any case, nothing but
the memories of its past existences; but it would hardly seem to
be so upon any of the theories now generally accepted; as,
indeed, is very readily admitted by Mr. Darwin himself, who even,
as regards purely-bred animals and plants, remarks that “we
are quite unable to assign any proximate cause” for their
tendency to at times reassume long lost characters.
If the reader will follow for himself the remaining phenomena
of reversion, he will, I believe, find them all explicable on the
theory that they are due to memory of past experiences fused, and
modified—at times specifically and definitely—by
changed conditions. There is, however, one apparently very
important phenomenon which I do not at this moment see how to
connect with memory, namely, the tendency on the part of
offspring to revert to an earlier impregnation. Mr.
Darwin’s “Provisional Theory of Pangenesis”
seemed to afford a satisfactory explanation of this; but the
connection with memory was not immediately apparent. I
think it likely, however, that this difficulty will vanish on
further consideration, so I will not do more than call attention
to it here.
The instincts of certain neuter insects hardly bear upon
reversion, but will be dealt with at some length in Chapter
XII.
V. We should expect to find, as was insisted on in the
preceding section in reference to the sterility of hybrids, that
it required many, or at any rate several, generations of changed
habits before a sufficiently deep impression could be made upon
the living being (who must be regarded always as one person in
his whole line of ascent or descent) for it to be unconsciously
remembered by him, when making himself anew in any succeeding
generation, and thus to make him modify his method of procedure
during his next embryological development. Nevertheless, we
should expect to find that sometimes a very deep single
impression made upon a living organism, should be remembered by
it, even when it is next in an embryonic condition.
That this is so, we find from Mr. Darwin, who writes
(“Plants and Animals under Domestication,” vol. ii.
p. 57, ed. 1875)—“There is ample evidence that the
effect of mutilations and of accidents, especially, or perhaps
exclusively, when followed by disease” (which would
certainly intensify the impression made), “are occasionally
inherited. There can be no doubt that the evil effects of
the long continued exposure of the parent to injurious conditions
are sometimes transmitted to the offspring.” As
regards impressions of a less striking character, it is so
universally admitted that they are not observed to be repeated in
what is called the offspring, until they have been confirmed in
what is called the parent, for several generations, but that
after several generations, more or fewer as the case may be, they
often are transmitted—that it seems unnecessary to say more
upon the matter. Perhaps, however, the following passage
from Mr. Darwin may be admitted as conclusive:—
“That they” (acquired actions) “are
inherited, we see with horses in certain transmitted paces, such
as cantering and ambling, which are not natural to them—in
the pointing of young pointers, and the setting of young
setters—in the peculiar manner of flight of certain breeds
of the pigeon, &c. We have analogous cases with mankind
in the inheritance of tricks or unusual gestures.” . . .
(“Expression of the Emotions,” p. 29).
In another place Mr. Darwin writes:—
“How again can we explain the inherited effects
of the use or disuse of particular organs? The domesticated
duck flies less and walks more than the wild duck, and its limb
bones have become diminished and increased in a corresponding
manner in comparison with those of the wild duck. A horse
is trained to certain paces, and the colt inherits similar
consensual movements. The domesticated rabbit becomes tame
from close confinement; the dog intelligent from associating with
man; the retriever is taught to fetch and carry; and these mental
endowments and bodily powers are all inherited”
(“Plants and Animals,” &c., vol. ii. p. 367, ed.
1875).
“Nothing,” he continues, “in the whole
circuit of physiology is more wonderful. How can the use or
disuse of a particular limb, or of the brain, affect a small
aggregate of reproductive cells, seated in a distant part of the
body in such a manner that the being developed from these cells
inherits the character of one or both parents? Even an
imperfect answer to this question would be satisfactory”
(“Plants and Animals,” &c. vol. ii. p. 367, ed.
1875).
With such an imperfect answer will I attempt to satisfy the
reader, as to say that there appears to be that kind of
continuity of existence and sameness of personality, between
parents and offspring, which would lead us to expect that the
impressions made upon the parent should be epitomised in the
offspring, when they have been or have become important enough,
through repetition in the history of several so-called existences
to have earned a place in that smaller edition, which is issued
from generation to generation; or, in other words, when they have
been made so deeply, either at one blow or through many, that the
offspring can remember them. In practice we observe this to
be the case—so that the answer lies in the assertion that
offspring and parent, being in one sense but the same individual,
there is no great wonder that, in one sense, the first should
remember what had happened to the latter; and that too, much in
the same way as the individual remembers the events in the
earlier history of what he calls his own lifetime, but condensed,
and pruned of detail, and remembered as by one who has had a host
of other matters to attend to in the interim.
It is thus easy to understand why such a rite as circumcision,
though practised during many ages, should have produced little,
if any, modification tending to make circumcision
unnecessary. On the view here supported such modification
would be more surprising than not, for unless the impression made
upon the parent was of a grave character—and probably
unless also aggravated by subsequent confusion of memories in the
cells surrounding the part originally impressed—the parent
himself would not be sufficiently impressed to prevent him from
reproducing himself, as he had already done upon an infinite
number of past occasions. The child, therefore, in the womb
would do what the father in the womb had done before him, nor
should any trace of memory concerning circumcision be expected
till the eighth day after birth, when, but for the fact that the
impression in this case is forgotten almost as soon as made, some
slight presentiment of coming discomfort might, after a large
number of generations, perhaps be looked for as a general
rule. It would not, however, be surprising, that the effect
of circumcision should be occasionally inherited, and it would
appear as though this was sometimes actually the case.
The question should turn upon whether the disuse of an organ
has arisen:—
1. From an internal desire on the part of the creature
disusing it, to be quit of an organ which it finds
troublesome.
2. From changed conditions and habits which render the
organ no longer necessary, or which lead the creature to lay
greater stress on certain other organs or modifications.
3. From the wish of others outside itself; the effect
produced in this case being perhaps neither very good nor very
bad for the individual, and resulting in no grave impression upon
the organism as a whole.
4. From a single deep impression on a parent, affecting
both himself as a whole, and gravely confusing the memories of
the cells to be reproduced, or his memories in respect of those
cells—according as one adopts Pangenesis and supposes a
memory to “run” each gemmule, or as one supposes one
memory to “run” the whole impregnate ovum—a
compromise between these two views being nevertheless perhaps
possible, inasmuch as the combined memories of all the cells may
possibly be the memory which “runs” the
impregnate ovum, just as we are ourselves the combination
of all our cells, each one of which is both autonomous, and also
takes its share in the central government. But within the
limits of this volume it is absolutely impossible for me to go
into this question.
In the first case—under which some instances which
belong more strictly to the fourth would sometimes, but rarely,
come—the organ should soon go, and sooner or later leave no
rudiment, though still perhaps to be found crossing the life of
the embryo, and then disappearing.
In the second it should go more slowly, and leave, it may be,
a rudimentary structure.
In the third it should show little or no sign of natural
decrease for a very long time.
In the fourth there may be absolute and total sterility, or
sterility in regard to the particular organ, or a scar which
shall show that the memory of the wound and of each step in the
process of healing has been remembered; or there may be simply
such disturbance in the reproduced organ as shall show a confused
recollection of injury. There may be infinite gradations
between the first and last of these possibilities.
I think that the facts, as given by Mr. Darwin (“Plants
and Animals,” &c., vol. i. pp. 466–472, ed.
1875), will bear out the above to the satisfaction of the
reader. I can, however, only quote the following
passage:—
“ . . . Brown Séquard has bred during thirty
years many thousand guinea-pigs, . . . nor has he ever seen a
guinea-pig born without toes which was not the offspring of
parents which had gnawed off their own toes, owing to the
sciatic nerve having been divided. Of this fact thirteen
instances were carefully recorded, and a greater number were
seen; yet Brown Séquard speaks of such cases as among the
rarer forms of inheritance. It is a still more interesting
fact—‘that the sciatic nerve in the congenitally
toeless animal has inherited the power of passing through all
the different morbid states which have occurred in one of its
parents from the time of division till after its reunion
with the peripheric end. It is not therefore the power of
simply performing an action which is inherited, but the power of
performing a whole series of actions in a certain
order.’”
I feel inclined to say it is not merely the original wound
that is remembered, but the whole process of cure which is now
accordingly repeated. Brown Séquard concludes, as
Mr. Darwin tells us, “that what is transmitted is the
morbid state of the nervous system,” due to the operation
performed on the parents.
A little lower down Mr. Darwin writes that Professor Rolleston
has given him two cases—“namely, of two men, one of
whom had his knee, and the other his cheek, severely cut, and
both had children born with exactly the same spot marked or
scarred.”
VI. When, however, an impression has once reached
transmission point—whether it be of the nature of a sudden
striking thought, which makes its mark deeply then and there, or
whether it be the result of smaller impressions repeated until
the nail, so to speak, has been driven home—we should
expect that it should be remembered by the offspring as something
which he has done all his life, and which he has therefore no
longer any occasion to learn; he will act, therefore, as people
say, instinctively. No matter how complex and
difficult the process, if the parents have done it sufficiently
often (that is to say, for a sufficient number of generations),
the offspring will remember the fact when association wakens the
memory; it will need no instruction, and—unless when it has
been taught to look for it during many generations—will
expect none. This may be seen in the case of the
humming-bird sphinx moth, which, as Mr. Darwin writes,
“shortly after its emergence from the cocoon, as shown by
the bloom on its unruffled scales, may be seen poised stationary
in the air with its long hair-like proboscis uncurled, and
inserted into the minute orifices of flowers; and no one I
believe has ever seen this moth learning to perform its
difficult task, which requires such unerring aim”
(“Expression of the Emotions,” p. 30).
And, indeed, when we consider that after a time the most
complex and difficult actions come to be performed by man without
the least effort or consciousness—that offspring cannot be
considered as anything but a continuation of the parent life,
whose past habits and experiences it epitomises when they have
been sufficiently often repeated to produce a lasting
impression—that consciousness of memory vanishes on the
memory’s becoming intense, as completely as the
consciousness of complex and difficult movements vanishes as soon
as they have been sufficiently practised—and finally, that
the real presence of memory is testified rather by performance of
the repeated action on recurrence of like surroundings, than by
consciousness of recollecting on the part of the
individual—so that not only should there be no reasonable
bar to our attributing the whole range of the more complex
instinctive actions, from first to last, to memory pure and
simple, no matter how marvellous they may be, but rather that
there is so much to compel us to do so, that we find it difficult
to conceive how any other view can have been ever
taken—when, I say, we consider all these facts, we should
rather feel surprise that the hawk and sparrow still teach their
offspring to fly, than that the humming-bird sphinx moth should
need no teacher.
The phenomena, then, which we observe are exactly those which
we should expect to find.
VII. We should also expect that the memory of animals,
as regards their earlier existences, was solely stimulated by
association. For we find, from Prof. Bain, that
“actions, sensations, and states of feeling occurring
together, or in close succession, tend to grow together or cohere
in such a way that when any one of them is afterwards presented
to the mind, the others are apt to be brought up in idea”
(“The Senses and the Intellect,” 2d ed. 1864, p.
332). And Prof. Huxley says (“Elementary Lessons in
Physiology,” 5th ed. 1872, p. 306), “It may be laid
down as a rule that if any two mental states be called up
together, or in succession, with due frequency and vividness, the
subsequent production of the one of them will suffice to call up
the other, and that whether we desire it or
not.” I would go one step further, and would say
not only whether we desire it or not, but whether we are aware
that the idea has ever before been called up in our minds or
not. I should say that I have quoted both the above
passages from Mr. Darwin’s “Expression of the
Emotions” (p. 30, ed. 1872).
We should, therefore, expect that when the offspring found
itself in the presence of objects which had called up such and
such ideas for a sufficient number of generations, that is to
say, “with due frequency and vividness”—it
being of the same age as its parents were, and generally in like
case as when the ideas were called up in the minds of the
parents—the same ideas should also be called up in the
minds of the offspring “whether they desire it or
not;” and, I would say also, “whether they
recognise the ideas as having ever before been present to them or
not.”
I think we might also expect that no other force, save that of
association, should have power to kindle, so to speak, into the
flame of action the atomic spark of memory, which we can alone
suppose to be transmitted from one generation to another.
That both plants and animals do as we should expect of them in
this respect is plain, not only from the performance of the most
intricate and difficult actions—difficult both physically
and intellectually—at an age, and under circumstances which
preclude all possibility of what we call instruction, but from
the fact that deviations from the parental instinct, or rather
the recurrence of a memory, unless in connection with the
accustomed train of associations, is of comparatively rare
occurrence; the result, commonly, of some one of the many
memories about which we know no more than we do of the memory
which enables a cat to find her way home after a hundred-mile
journey by train, and shut up in a hamper, or, perhaps even more
commonly, of abnormal treatment.
VIII. If, then, memory depends on association, we should
expect two corresponding phenomena in the case of plants and
animals—namely, that they should show a tendency to resume
feral habits on being turned wild after several generations of
domestication, and also that peculiarities should tend to show
themselves at a corresponding age in the offspring and in the
parents. As regards the tendency to resume feral habits,
Mr. Darwin, though apparently of opinion that the tendency to do
this has been much exaggerated, yet does not doubt that such a
tendency exists, as shown by well authenticated instances.
He writes: “It has been repeatedly asserted in the most
positive manner by various authors that feral animals and plants
invariably return to their primitive specific type.”
This shows, at any rate, that there is a considerable opinion
to this effect among observers generally.
He continues: “It is curious on what little evidence
this belief rests. Many of our domesticated animals could
not subsist in a wild state,”—so that there is no
knowing whether they would or would not revert. “In
several cases we do not know the aboriginal parent species, and
cannot tell whether or not there has been any close degree of
reversion.” So that here, too, there is at any rate
no evidence against the tendency; the conclusion, however,
is that, notwithstanding the deficiency of positive evidence to
warrant the general belief as to the force of the tendency, yet
“the simple fact of animals and plants becoming feral does
cause some tendency to revert to the primitive state,” and
he tells us that “when variously-coloured tame rabbits are
turned out in Europe, they generally re-acquire the colouring of
the wild animal;” “there can be no doubt,” he
says, “that this really does occur,” though he seems
inclined to account for it by the fact that oddly-coloured and
conspicuous animals would suffer much from beasts of prey and
from being easily shot. “The best known case of
reversion:” he continues, “and that on which the
widely-spread belief in its universality apparently rests, is
that of pigs. These animals have run wild in the West
Indies, South America, and the Falkland Islands, and have
everywhere re-acquired the dark colour, the thick bristles, and
great tusks of the wild boar; and the young have re-acquired
longitudinal stripes.” And on page 22 of
“Plants and Animals under Domestication” (vol. ii.
ed. 1875) we find that “the re-appearance of coloured,
longitudinal stripes on young feral pigs cannot be attributed to
the direct action of external conditions. In this case, and
in many others, we can only say that any change in the habits of
life apparently favours a tendency, inherent or latent, in the
species to return to the primitive state.” On which
one cannot but remark that though any change may favour such
tendency, yet the return to original habits and surroundings
appears to do so in a way so marked as not to be readily
referable to any other cause than that of association and
memory—the creature, in fact, having got into its old
groove, remembers it, and takes to all its old ways.
As regards the tendency to inherit changes (whether embryonic,
or during post-natal development as ordinarily observed in any
species), or peculiarities of habit or form which do not partake
of the nature of disease, it must be sufficient to refer the
reader to Mr. Darwin’s remarks upon this subject
(“Plants and Animals Under Domestication,” vol. ii.
pp. 51–57, ed. 1875). The existence of the tendency
is not likely to be denied. The instances given by Mr.
Darwin are strictly to the point as regards all ordinary
developmental and metamorphic changes, and even as regards
transmitted acquired actions, and tricks acquired before the time
when the offspring has issued from the body of the parent, or on
an average of many generations does so; but it cannot for a
moment be supposed that the offspring knows by inheritance
anything about what happens to the parent subsequently to the
offspring’s being born. Hence the appearance of
diseases in the offspring, at comparatively late periods in life,
but at the same age as, or earlier, than in the parents, must be
regarded as due to the fact that in each case the machine having
been made after the same pattern (which is due to memory),
is liable to have the same weak points, and to break down after a
similar amount of wear and tear; but after less wear and tear in
the case of the offspring than in that of the parent, because a
diseased organism is commonly a deteriorating organism, and if
repeated at all closely, and without repentance and amendment of
life, will be repeated for the worse. If we do not improve,
we grow worse. This, at least, is what we observe
daily.
Nor again can we believe, as some have fancifully imagined,
that the remembrance of any occurrence of which the effect has
been entirely, or almost entirely mental, should be remembered by
offspring with any definiteness. The intellect of the
offspring might be affected, for better or worse, by the general
nature of the intellectual employment of the parent; or a great
shock to a parent might destroy or weaken the intellect of the
offspring; but unless a deep impression were made upon the cells
of the body, and deepened by subsequent disease, we could not
expect it to be remembered with any definiteness, or
precision. We may talk as we will about mental pain, and
mental scars, but after all, the impressions they leave are
incomparably less durable than those made by an organic
lesion. It is probable, therefore, that the feeling which
so many have described, as though they remembered this or that in
some past existence, is purely imaginary, and due rather to
unconscious recognition of the fact that we certainly have lived
before, than to any actual occurrence corresponding to the
supposed recollection.
And lastly, we should look to find in the action of memory, as
between one generation and another, a reflection of the many
anomalies and exceptions to ordinary rules which we observe in
memory, so far as we can watch its action in what we call our own
single lives, and the single lives of others. We should
expect that reversion should be frequently capricious—that
is to say, give us more trouble to account for than we are either
able or willing to take. And assuredly we find it so in
fact. Mr. Darwin—from whom it is impossible to quote
too much or too fully, inasmuch as no one else can furnish such a
store of facts, so well arranged, and so above all suspicion of
either carelessness or want of candour—so that, however we
may differ from him, it is he himself who shows us how to do so,
and whose pupils we all are—Mr. Darwin writes: “In
every living being we may rest assured that a host of long-lost
characters lie ready to be evolved under proper conditions”
(does not one almost long to substitute the word
“memories” for the word
“characters?”) “How can we make
intelligible, and connect with other facts, this wonderful and
common capacity of reversion—this power of calling back to
life long-lost characters?” (“Plants and
Animals,” &c., vol. ii. p. 369, ed. 1875). Surely
the answer may be hazarded, that we shall be able to do so when
we can make intelligible the power of calling back to life
long-lost memories. But I grant that this answer holds out
no immediate prospect of a clear understanding.
One word more. Abundant facts are to be found which
point inevitably, as will appear more plainly in the following
chapter, in the direction of thinking that offspring inherits the
memories of its parents; but I know of no single fact which
suggests that parents are in the smallest degree affected (other
than sympathetically) by the memories of their offspring after
that offspring has been born. Whether the unborn
offspring affects the memory of the mother in some particulars,
and whether we have here the explanation of occasional reversion
to a previous impregnation, is a matter on which I should hardly
like to express an opinion now. Nor, again, can I find a
single fact which seems to indicate any memory of the parental
life on the part of offspring later than the average date of the
offspring’s quitting the body of the parent.