Obviously the memory of a habit or experience will not commonly be transmitted to offspring in that perfection which is called “instinct,” till the habit or experience has been repeated in several generations with more or less uniformity; for otherwise the impression made will not be strong enough to endure through the busy and difficult task of reproduction. This of course involves that the habit shall have attained, as it were, equilibrium with the creature’s sense of its own needs, so that it shall have long seemed the best course possible, leaving upon the whole and under ordinary circumstances little further to be desired, and hence that it should have been little varied during many generations. We should expect that it would be transmitted in a more or less partial, varying, imperfect, and intelligent condition before equilibrium had been attained; it would, however, continually tend towards equilibrium.
When this stage has been reached, as regards any habit, the creature will cease trying to improve; on which the repetition of the habit will become stable, and hence capable of more unerring transmission—but at the same time improvement will cease; the habit will become fixed, and be perhaps transmitted at
an earlier and earlier age, till it has reached that date of manifestation which shall be found most agreeable to the other habits of the creature. It will also be manifested, as a matter of course, without further consciousness or reflection, for people cannot be always opening up settled questions; if they thought a matter all over yesterday they cannot think it all over again to-day, what they thought then they will think now, and will act upon their opinion; and this, too, even in spite sometimes of misgiving, that if they were to think still further they could find a still better course. It is not, therefore, to be expected that “instinct” should show signs of that hesitating and tentative action which results from knowledge that is still so imperfect as to be actively self-conscious; nor yet that it should grow or vary perceptibly unless under such changed conditions as shall baffle memory, and present the alternative of either invention—that is to say, variation—or death.
But every instinct must have passed through the laboriously intelligent stages through which human civilisations and mechanical inventions are now passing; and he who would study the origin of an instinct with its development, partial transmission, further growth, further transmission, approach to more unreflecting stability, and finally, its perfection as an unerring and unerringly transmitted instinct, must look to laws, customs, and machinery as his best instructors. Customs and machines are instincts and organs now in process of development; they will assuredly one day reach the unconscious state of equilibrium which we observe in the structures and instincts of bees and ants, and an approach to which may be found among some savage nations. We may reflect, however, not without pleasure,
that this condition—the true millennium—is still distant. Nevertheless the ants and bees seem happy; perhaps more happy than when so many social questions were in as hot discussion among them as other and not dissimilar ones will one day be amongst ourselves.
And this, as will be apparent, opens up the whole question of the stability of species, which we cannot follow further here, than to say, that according to the balance of testimony, many plants and animals do appear to have reached a phase of being from which they are hard to move—that is to say, they will die sooner than be at the pains of altering their habits—true martyrs to their convictions. Such races refuse to see changes in their surroundings as long as they can, but when compelled to recognise them, they throw up the game because they cannot and will not, or will not and cannot, invent.
This is perfectly intelligible, for a race is nothing but a long-lived individual, and like any individual, or tribe of men whom we have yet observed, will have its special capacities and its special limitations, though, as in the case of the individual, so also with the race, it is exceedingly hard to say what those limitations are, and why, having been able to go so far, it should go no further. Every man and every race is capable of education up to a certain point, but not to the extent of being made from a sow’s ear into a silk purse. The proximate cause of the limitation seems to lie in the absence of the wish to go further; the presence or absence of the wish will depend upon the nature and surroundings of the individual, which is simply a way of saying that one can get no further, but that as the song (with a slight alteration) says:—
“Some breeds do, and some breeds don’t,
Some breeds will, but this breed won’t:
I tried very often to see if it would,
But it said it really couldn’t, and I don’t think it could.”
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M. Ribot in his work on Heredity [119] writes (p. 14):—“The duckling hatched by the hen makes straight for water.” In what conceivable way can we account for this, except on the supposition that the duckling knows perfectly well what it can and what it cannot do with water, owing to its recollection of what it did when it was still one individuality with its parents, and hence, when it was a duckling before?