Mental change in cardiac disease, though a rare complication, is a subject that can be properly and usefully discussed at a meeting of psychiatrists at which physicians are asked to take part. For while the physician may be able to assess accurately the physical defect in the circulatory apparatus, he is trained only in a rough-and-ready way to interpret different types of character, and the way in which they react to disease, and is liable to go astray in his interpretation of mental states. There is also this advantage—that in the present state of uncertainty as to the physical basis of mental disease we cannot look at the subject from too many points of view.