The third volume in the Isaac Ray Award Series and first to be written from the legal viewpoint, this is the tightknit contribution of the Chief Judge of the United States Court of Appeals for the Third Circuit, to the goal of a working alliance between psychiatry and law. Concerning himself with cases of homicide which point up most sharply the disparities between psychiatric discoveries and legal doctrine, Judge Biggs traces the history of legal codes in their varying considerations of ""the guilty mind"" from prehistorical times to the Twentieth Century. He writes of the cases which led to the M'Naghten Rules which are still being used as a base for the determining of legal sanity today although they do not take into consideration the possibility that a person may realize the quality and nature of his act, that it is wrong, without having the capacity to conduct himself accordingly. He points out the work that is in process in regard to this all-important matter and also indicates the need for psychiatric cooperation in crime-prevention, prison rehabilitation and research. Important to the field.