[Bain's footnote 87: The recognition of an act as a former act, or of a present sensation as having formerly occurred, is a *phase of the intellectual power named consciousness of Agreement, or Similarity, which is both an essential of our Knowledge, and a means of mental Reproduction. The defectiveness of the author's view of this function of the intellect has been elsewhere commented on.--_B._]
Our inquiry is, what this part of our constitution, so highly important to us, is composed of. All inquirers are agreed, that it is complex; but what the elements are into which it may be resolved, has not been very successfully made out.
It is proper to begin with the elements which are universally acknowledged. Among them, it is certain, that IDEAS are the fundamental part. Nothing is remembered but through its IDEA. The memory, however, of a thing, and the idea of it, are not the same. The idea may be without the memory; but the memory cannot be without the idea. The idea of an elephant may occur to me, without the thought of its having been an object of my senses. But I cannot have the thought of its having been an object of my senses, without having the idea of the animal at the { 321} same time. The consciousness, therefore, which I call memory, is an idea, but not an idea alone; it is an idea and something more. So far is our inquiry narrowed. What is that which, combined with an idea, constitutes memory?
That memory may be, the idea must be. In what manner is the idea produced?
We have already seen in what manner an idea is called into existence by association. It is easy to prove that the idea which forms part of memory is called up in the same way, and no other. If I think of any case of memory, I shall always find that the idea, or the sensation which preceded the memory, was one of those which are calculated, according to the laws of association, to call up the idea involved in that case of memory; and that it was by the preceding idea, or sensation, that the idea of memory was in reality brought into the mind. I have not seen a person with whom I was formerly intimate for a number of years; nor have I, during all that interval, had occasion to think of him. Some object which had been frequently presented to my senses along with him, or the idea of something with which I have strongly associated the idea of him, occurs to me; instantly the memory of him exists. The friend with whom I had often seen him in company, accidentally meets me; a letter of his which had been long unobserved, falls under my eye; or an observation which he was fond of producing, is repeated in my hearing; these are circumstances all associated with the idea of the individual in question; the idea of him is excited by them, and with the mere idea of the { 322} man, all the other circumstances which constitute memory.