Dagonet says stupor results from various causes, such as exhaustion, or emotional and intellectual factors. Clinically it varies in kind and degree according to the situation in which it develops. When it develops during normal mental health, it disappears when its cause does. In insanity it appears in the course of a psychosis of some duration, of which it seems a part, an exaggeration of some symptom of the general condition. Evidently he views stupor as a type of reaction: as a more or less complete suspension of the operation of intellectual faculties, a more or less sudden subtraction of nervous forces. This reaction can result from a fright or the memory of it, a brain lesion or trauma, the action of narcotics, exhausting fevers, excessive grief, the terrors of alcoholic hallucinations, epileptic seizures, profound anemia and nervous exhaustion consequent on sexual excess. He is careful to say that both symptoms and treatment vary with the varied etiologies. He credits Pinel with being the first to call attention to stupor. This author claimed that some persons with extreme sensibility could be so upset by any violent emotion as to have their faculties suspended or obliterated. He noted, too, that stupors frequently terminated in manic phases of 20 to 30 days’ duration. Pinel also emphasized the apathy of these cases. Esquirol called stupor “acute dementia,” a term which persisted in French literature for a long time. He described an interesting circular case where alternations between mania and typical stupor took place. He mentions too the dangerous, impulsive tendencies of many patients. Georget emphasized the fact which Pinel had also noted, that retrospectively the stupor patient says his mind was a blank during the attack. In 1835 Etoc-Demazy published on the subject. He regarded stupor not as a separate form of insanity but a complication ensuing on monomania or mania. He recognized the partial as well as complete stupor. He thought the condition was due to cerebral edema, as did other writers of that period. Dagonet remarks about this last--a lesson not learned in fifty years by the profession--that demonstrable edema does _not_ produce the typical symptoms of stupor. Baillarger in 1843 (Annales Médico-psychologiques) was the first whose ambition to simplify psychiatric types led to denial of a separate kind of reaction. He claimed that stupor was not a form of insanity but an extension of a “délire mélancholique.” As Dagonet remarks, every symptom by which he characterizes stupor is a psychiatric symptom and insanity can consist just as well in the diminution as the perversion or exaltation of normal faculties. Some of Baillarger’s cases had false ideas, some apparently none at all. Dagonet thinks this justifies two types, one a dream-like state and another where no ideas are present, although he admits one may be an exaggeration of the other. Brierre de Boismont (Annales Médico-psychologique, 1851, p.