Abstract
In this paper the author endeavours to demonstrate the unsoundness of the prevailing opinion of polymorphism in the heredity of mental disease. He quotes Kirchhoff, Scholtz, and others, who hold the view that a child of parents mentally afflicted may, to a certain extent, be expected to suffer from some functional, nervous, or mental disorder; but that that child is not to be expected to suffer necessarily from the same form of mental disorder as its parents. Sioli believes that mania, melancholia, and circular insanity mutually replace one another in heredity. Kraepelin and Harbolla believe that the form of psychosis in the descendants is, in the majority of cases, similar to that observed in the ancestors.
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