This vintage work contains a treatise on an anthropological interpretation of sadism, masochism, and lycanthropy, which has been compiled from the notes of a lecture delivered at a meeting of the 'Royal Society of Medicine'. This fascinating and arresting collection of notes will be of considerable utility to anyone with an interest in psychiatry or the influential work of Robert Eisler. It is a book not to be missed by collectors of this kind of literature. Many antiquarian books such as this are becoming increasingly rare and expensive, and it is with this in mind that we are republishing this volume now in an affordable, modern edition complete with a new prefatory biography of the author.