No better psychoses could be chosen for a preliminary effort than benign stupors. Every psychiatrist has seen them, although they are wrongly diagnosed as a rule, and they play no small rôle in the world’s history. Euripides represents Orestes as having a stupor which is pictured as accurately as any modern psychiatrist could describe an actual case.[1] St. Paul is chronicled as falling to the ground, being thereafter blind and going without food or drink for three days. While apparently unconscious he had a religious vision. St. Catherine of Siena had several unquestionable stupors, which are fairly well described. In fact the mystics in general seem to have had communion with God and the saints most often when they seemed unconscious to bystanders.[2] The obsession with death, which seems so intimate a part of the stupor reaction, is a fundamental theme in poetry, religion and philosophy. The psychology of this interest is, speaking broadly, the psychology of stupor. So, from a general standpoint, our problem is related to the study of one of the most potent ideas which move the soul of man. Psychiatrically, stupors have long remained an unsolved riddle. In the century prior to 1872 (See the digest of Dagonet’s publication in Chapter XV) French psychiatrists wrote some good descriptions of stupor and offered brilliant, though sketchy generalizations about the condition. Two years later an English psychiatrist (Newington, See Chapter XV) improved on the French work. Little light has been thrown on the subject since then. The researches of the later French School showed that stupor often occurs in the course of major hysteria, but this left many of these episodes obviously not hysterical. When serious attempts were made at classification, this ubiquitous symptom complex was hard to handle. Wernicke wisely refrained from attempting more than a loose descriptive grouping. He called all conditions with marked inactivity and apathy “akinetic psychoses” and said that some recovered, some did not. Taxonomic zeal began to blind vision when Kahlbaum formulated his “Catatonia” and included stupor in the symptom complex. The condition which we call stupor occurs in the course of many different types of mental disease. It is true that it is frequent in catatonia but is not exclusively there. Mongols have black hair and straight hair, but one cannot therefore say that any black and straight haired man is a Mongol. Fortunately Kahlbaum prevented serious error by leaving the prognosis of his catatonia open. When Kraepelin included it in his large group of Dementia præcox, however, it implied that stupor could not be an acute, recoverable condition.[3] He unquestionably advanced psychiatry greatly but his scheme was too ambitious to be accurate. Many observers saw patients, classified as dements according to Kraepelin’s formulæ, return, apparently normal, to normal life. Finally Kirby[4] published a