The notes of five cases of phthisis with mental disorder are given, in which it is difficult not to believe that the insanity was of tubercular origin. The author briefly reviews the observations of various alienists in this relation. At the same time, it is difficult to define any form of insanity as purely phthisical; from melancholia and neurasthenia to confirmed dementia and violent dangerous mania may be seen. In certain criminal cases, phthisis is a factor to be considered. As regards the pathology of the mental signs, Bernheim dwells on the marked influence of infectious agents on the nervous system generally. The ætiological importance of pulmonary phthisis in the causation of mental disorders, in addition to the weight it derives from clinical observation, is supported by the marked analogy which one finds between the pathogeny of psychical disorders of infectious origin and the pathogeny of the psychopathies co-existing with tuberculosis, and by experimental proofs.
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