Disorders. It frequently happens that other graphic records fail us in analysing these the common distur bances; electrocardiography is the last court. Of appeal and its judgment is rarely at fault. There are certain abnormal types of heart action upon which other methods are almost, if not quite, silent; knowledge of these conditions is in the almost exclusive possession of electrocardiography; when such are described I shall refer brie?y to the manner in which they affect the management of the patient. Finally, the electric curves have revealed a number of new physical signs, associated with the abnormal. Distribution and arrange ment of the muscular masses in the heart. These will be discussed.