Mr. Wilfred Trotter, the distinguished surgeon and author, died in November 1939 at the age of sixty-seven. He was one of the first two or three in England to appreciate the significance of Freud's work, which I came to know through him. He was one of the rapidly diminishing group who attended the first International Congress at Salzburg in 1908. Though he followed the development of Psycho-Analysis to the end of his life (he revised the translation of the Moses book, for instance), he took no active part in it. He was himself, among many other things, an amateur psychologist of distinction and his endeavour to make out a case for the biological basis of the herd instinct aroused much attention. He was a member of the Council of the Royal Society that conferred their Honorary Membership on Professor Freud and he attended him medically after his removal to England.