The intelligent note on page 51 of my third volume was written by Bourne, as I state in the note itself, but I did not speak of the large amount of study he gave to it. I never knew a man take keener interest in anything, and as we had all the necessary authorities at hand, he worked over them for two days, coming down on the morning of the third day with the triumphant air of one who had wrestled successfully with a mathematical problem all night. He sat down and, as I remember it, wrote the note substantially as it now stands in the volume. He was very strong on all economic and sociological questions, displaying in a marked degree the intellectual stimulus he had derived from his association with Professor Sumner. He was a born controversialist and liked to argue. "The appetite comes in eating" is a French saying, and with Bourne his knowledge seemed to be best evolved by the actual joint working and collision with another mind. I remember one felicitous suggestion of Bourne's which after much working over we incorporated into a paragraph to our common satisfaction; and this paragraph received commendation in some critical notice. Showing this to Bourne, I said: "That is the way of the world. You did the thinking, I got the credit." Bourne had, however, forgotten his part in the paragraph. His mind was really so full of knowledge, when one could get at it, that he did not remember giving off any part of it. In addition to his quality of close concentration, he acquired a good deal of knowledge in a desultory way. In my library when conversation lagged he would go to the shelves and take down book after book, reading a little here or there, lighting especially upon any books that had been acquired since his previous visit, and with reading he would comment. This love of browsing in a library he acquired when a boy, so his brother informs me, and when at Yale it was said that he knew the library as well as the librarian himself.