Abhandlungen aus der Neurologie, Psychiatrie, Psychologie und ihren Grenzgebieten.

JAMA. 1926;86(16):1237. doi:10.1001/jama.1926.02670420061035.
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The author has studied the families of patients with schizophrenia and determined the psychosis present in each member. He roughly classifies each of the individuals of his series, according to the modern trend, into schizoid, cyclothymic and mixed personalities. He gives the following interesting figures: in schizophrenic patients, both parents were schizoid in 52 per cent, one parent in 46 per cent, and neither parent in only 2 per cent. Between 40 and 50 per cent of the collaterals were schizoid, 25 per cent cycloid, and only 11 per cent of the mixed type. The author finds that the majority of schizophrenic patients come from families which have contained one or more members suffering from the same psychosis. The same observation holds true for manic-depressive insanity. In both these groups, the patient before the development of his psychosis is usually schizoid in the schizophrenic and cyclothymic in the manic-depressive. When


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