Suspiciousness, so the author remarks, arises under the most varied circumstances in individuals and whole races. What unconscious motives has it and which repressing tendencies are responsible for it? Through the analysis of several cases these questions are answered in the sense that the feeling of constant apprehension which accompanies suspiciousness arises from a feeling of disturbed libido, a conflict, most often, between the wish for incest and its severe prohibition. The fact that suspiciousness is seen in deaf people so often is commented on. Obviously, Dr. Deutsch