"Another class of twelve or fourteen, in the same year, on Descartes, Spinoza, and Leibnitz, met in one of the 'tower rooms' of Sever Hall, sitting around a table. Here we had to do mostly with pure metaphysics. And more striking still was the prominence of humanity and sensibility in his way of taking philosophic problems. I can see him now, sitting at the head of that heavy table of light-colored oak near the bow-window that formed the end of the room. My brother, a visitor at Cambridge, dropping in for an hour and seeing him with his vigorous air, bronzed and sanguine complexion, and brown tweeds, said, 'He looks more like a sportsman than a professor.' I think that the sporting men in college always felt a certain affinity to themselves on one side in the freshness and manhood that distinguished him in mind, appearance, and diction. It was, by the way, in this latter course that I first heard some of the philosophic phrases now identified with him. There was a great deal about the monist and pluralist views of the universe. The world of the monist was described as a 'block-universe' and the monist himself as 'wallowing in a sense of unbridled unity,' or something of the sort. He always wanted the men to write one or two 'theses' in the course of the year and to get to work early on them. He made a great deal of bibliography. He would say, 'I am no man for editions and references, no exact bibliographer.' But none the less he would put upon the blackboard full lists of books, English, French, German, and Italian, on our subject. His own reading was immense and systematic. No one has ever done justice to it, partly because he spoke with unaffected modesty of that side of his equipment.