A tribute is paid by the lecturer to Freud and his objective method of enquiry into human psychology. After a short description of the Freudian theory he comes to the stumbling-block which so many others like him fail to surmount, namely, the fact that the bulk of the repressed material is connected with the sexual instinct. He does not approach the subject of the 'psychology of courage' from the psycho-analytical point of view. His inferences are chiefly drawn from comparative biology based upon Trotter's herd instinct.