we couldn't get the centenary of the origin of species into our programme — that was nineteen fifty nine and we hadn't started then — but i did persuade tonight's speaker to deliver one of our early centenary lectures on the subject of darwin's subsequent book, that is the book on the descent of man, which appeared in eighteen seventy one, and i am sure that those of you who were there on that occasion in december eighteen seventy one will remember it as a stimulating and