The historical rôle of psychoanalysis in American psychiatry is traced briefly, along with an evaluation of its influence on leaders in psychiatry from 1914 to 1934. Knight then points out three main trends in psychoanalysis during the past ten years. First is the integration of psychoanalysis and psychiatry: the latter has become increasingly psychologic and dynamic and the former more oriented in psychiatry. A second trend is the application of psychoanalytic principles to hospital therapies other than psychotherapy. The third and most important trend is the modification of analytic technique in the psychoses and the general application of analytic principles to other types of psychotherapies.