This article is in the main a criticism of Urstein's contention that manic-depressive insanity is not an entity, but often only a periodic form of dementia praecox. Dr. Halberstadt regards the characters of the attacks of manic-depressive insanity as of more importance than its periodicity. He holds that there are eight syndromes of symptoms which are peculiar to this form of mental disorder, each syndrome containing motor, ideational, and affective elements. He points out, on the other hand, the fact that Magnan demonstrated periodic phases of depression and mania in degenerates, so that periodicity is not a feature peculiar to manic-depressive insanity.
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