ABSTRACT
We describe as schizoid and cycloid those abnormal personalities which fluctuate between sickness and health, which reflect the fundamental psychological symptoms of the schizophrene and the circular psychoses in the lighter form of personal oddities; such schizoid and cycloid types we find in the first place in the pre-psychotic personalities of the psychopaths themselves, and then in their nearest blood-relations. These two groups of men give us a secure foundation for our description. If we have investigated them, then we are finally justified in describing as schizoid and cycloid such abnormal individuals as, in their psychic and bodily habitus, are built analogously to these, without having the corresponding psychosis in their own immediate circle.
