But though it is not possible for any one to get a clear conception of Mr. Spencer’s meaning, we may say with more confidence what it was that he did not mean. He did not mean to make memory the keystone of his system; he has none of that sense of the unifying, binding force of memory which Professor Hering has so well expressed, nor does he show any signs of perceiving the far-reaching consequences that ensue if the phenomena of heredity are considered as phenomena of memory. Thus, when he is dealing with the phenomena of old age (vol. i. p. 538, ed. 2) he does not ascribe them to lapse and failure of memory, nor surmise the principle underlying longevity. He never mentions memory in connection with heredity without presently saying something which makes us involuntarily think of a man missing an easy catch at cricket; it is only rarely, however, that he connects the two at all. I have only been able to find the word “inherited” or any derivative of the verb “to inherit” in connection with memory once in all the 1300 long pages of the “Principles of Psychology.” It occurs in vol ii. p. 200, 2d ed., where the words stand, “Memory, inherited or acquired.” I submit that this was unintelligible when Mr. Spencer wrote it, for want of an explanation which he never gave; I submit, also, that he could not have left it unexplained, nor yet as an unrepeated expression not introduced till late in his work, if he had had any idea of its pregnancy. At any rate, whether he intended to imply what he now implies that he intended to imply (for Mr. Spencer, like the late Mr. Darwin, is fond of qualifying phrases), I have shown that those most able and willing to understand him did not take him to mean what he now appears anxious to have it supposed that he meant. Surely, moreover, if he had meant it he would have spoken sooner, when he saw his meaning had been missed. I can, however, have no hesitation in saying that if I had known the “Principles of Psychology” earlier, as well as I know the work now, I should have used it largely. It may be interesting, before we leave Mr. Spencer, to see whether he even now assigns to continued personality and memory the place assigned to it by Professor Hering and myself. I will therefore give the concluding words of the letter to the _Athenæum_ already referred to, in which he tells us to stand aside. He writes “I still hold that inheritance of functionally produced modifications is the chief factor throughout the higher stages of organic evolution, bodily as well as mental (see ‘Principles of Biology,’ i. 166), while I recognise the truth that throughout the lower stages survival of the fittest is the chief factor, and in the lowest the almost exclusive factor.”