On any repetition, however, the circumstances, external or internal, or both, never are absolutely identical: there is some slight variation in each individual case, and some part of this variation is remembered, with approbation or disapprobation as the case may be.
The fact, therefore, that on each repetition of the action there is one memory more than on the last but one, and that this memory is slightly different from its predecessor, is seen to be an inherent and, ex hypothesi, necessarily disturbing factor in all habitual action—and the life of an organism should, as has been sufficiently insisted on, be regarded as the habitual action of a single individual, namely, of the organism itself, and of its ancestors. This is the key to accumulation of improvement, whether in the arts which we assiduously
practise during our single life, or in the structures and instincts of successive generations. The memory does not complete a true circle, but is, as it were, a spiral slightly divergent therefrom. It is no longer a perfectly circulating decimal. Where, on the other hand, there is no memory of a like present, where, in fact, the memory is not, so to speak, spiral, there is no accumulation of improvement. The effect of any variation is not transmitted, and is not thus pregnant of still further change.
As regards the second of the two classes of actions above referred to—those, namely which are not recurrent or habitual, and at no point of which is there a memory of a past present like the one which is present now—there will have been no accumulation of strong and well-knit memory as regards the action as a whole, but action, if taken at all, will be taken upon disjointed fragments of individual actions (our own and those of other people) pieced together with a result more or less satisfactory according to circumstances.
But it does not follow that the action of two people who have had tolerably similar antecedents and are placed in tolerably similar circumstances should be more unlike each other in this second case than in the first. On the contrary, nothing is more common than to observe the same kind of people making the same kind of mistake when placed for the first time in the same kind of new circumstances. I did not say that there would be no sameness of action without memory of a like present. There may be sameness of action proceeding from a memory, conscious or unconscious, of like antecedents, and a presence only of like presents without recollection of the same.
The sameness of action of like persons placed under
like circumstances for the first time, resembles the sameness of action of inorganic matter under the same combinations. Let us for a moment suppose what we call non-living substances to be capable of remembering their antecedents, and that the changes they undergo are the expressions of their recollections. Then I admit, of course, that there is not memory in any cream, we will say, that is about to be churned of the cream of the preceding week, but the common absence of such memory from each week’s cream is an element of sameness between the two. And though no cream can remember having been churned before, yet all cream in all time has had nearly identical antecedents, and has therefore nearly the same memories and nearly the same proclivities. Thus, in fact, the cream of one week is as truly the same as the cream of another; week from the same cow, pasture, &c., as anything is ever the same with anything; for the having been subjected to like antecedents engenders the closest similarity that we can conceive of, if the substances were like to start with. Same is as same does.
The manifest absence of any connecting memory (or memory of like presents) from certain of the phenomena of heredity, such as, for example, the diseases of old age, is now seen to be no valid reason for saying that such other and far more numerous and important phenomena as those of embryonic development are not phenomena of memory. Growth and the diseases of old age do indeed, at first sight, appear to stand on the same footing. The question, however, whether certain results are due to memory or no must be settled not by showing that two combinations, neither of which can remember the other (as between each other), may yet generate like results, and therefore, considering the
memory theory disposed of for all other cases, but by the evidence we may be able to adduce in any particular case that the second agent has actually remembered the conduct of the first. Such evidence must show firstly that the second agent cannot be supposed able to do what it is plain he can do, except under the guidance of memory or experience, and secondly, that the second agent has had every opportunity of remembering. When the first of these tests fails, similarity of action on the part of two agents need not be connected with memory of a like present as well as of like antecedents; when both fail, similarity of action should be referred to memory of like antecedents only.
Returning to a parenthesis a few pages back, in which I said that consciousness of memory would be less or greater according to the greater or fewer number of times that the act had been repeated, it may be observed as a corollary to this, that the less consciousness of memory the greater the uniformity of action, and vice versâ. For the less consciousness involves the memory’s being more perfect, through a larger number (generally) of repetitions of the act that is remembered; there is therefore a less proportionate difference in respect of the number of recollections of this particular act between the most recent actor and the most recent but one. This is why very old civilisations, as those of many insects, and the greater number of now living organisms, appear to the eye not to change at all.