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In undertaking to make a detailed report of the case here discussed, I am guided by the principle first laid down by Freud2 and Breuer in connection with the psychoneuroses, applied with conspicuous success by Jung3 and Meyer4 to the prácox group of disorders, and by Abraham,5 Maeder,6 MacCurdy7 and C. M. Campbell8 to the manic-depressive group. This principle is that the psychosis is not a wild unordered outbreak of mental entities, due to physical disorders the causality of which cannot possibly be demonstrated,