Among the additions I intended making while the book was in the press, was a chapter on Mr. Darwin’s provisional theory of Pangenesis, which I felt convinced must be right if it was Mr. Darwin’s, and which I was sure, if I could once understand it, must have an important bearing on “Life and Habit.” I had not as yet seen that the principle I was contending for was Darwinian, not Neo-Darwinian. My pages still teemed with allusions to “natural selection,” and I sometimes allowed myself to hope that “Life and Habit” was going to be an adjunct to Darwinism which no one would welcome more gladly than Mr. Darwin himself. At this time I had a visit from a friend, who kindly called to answer a question of mine, relative, if I remember rightly, to “Pangenesis.” He came, September 26, 1877. One of the first things he said was, that the theory which had pleased him more than anything he had heard of for some time was one referring all life to memory. I said that was exactly what I was doing myself, and inquired where he had met with his theory. He replied that Professor Ray Lankester had written a letter about it in _Nature_ some time ago, but he could not remember exactly when, and had given extracts from a lecture by Professor Ewald Hering, who had originated the theory. I said I should not look at it, as I had completed that part of my work, and was on the point of going to press. I could not recast my work if, as was most likely, I should find something, when I saw what Professor Hering had said, which would make me wish to rewrite my own book; it was too late in the day and I did not feel equal to making any radical alteration; and so the matter ended with very little said upon either side. I wrote, however, afterwards to my friend asking him to tell me the number of _Nature_ which contained the lecture if he could find it, but he was unable to do so, and I was well enough content. A few days before this I had met another friend, and had explained to him what I was doing. He told me I ought to read Professor Mivart’s “Genesis of Species,” and that if I did so I should find there were two sides to “natural selection.” Thinking, as so many people do—and no wonder—that “natural selection” and evolution were much the same thing, and having found so many attacks upon evolution produce no effect upon me, I declined to read it. I had as yet no idea that a writer could attack Neo-Darwinism without attacking evolution. But my friend kindly sent me a copy; and when I read it, I found myself in the presence of arguments different from those I had met with hitherto, and did not see my way to answering them. I had, however, read only a small part of Professor Mivart’s work, and was not fully awake to the position, when the friend referred to in the preceding paragraph called on me.