Autistic reveries are non-adjustive to reality. They may be divided into several classes of which morbid-suicidal, pessimistic, megalomanic, denunciatory, and persecutory reveries are particularly common. In exaggerated form they become the most conspicuous feature of the personality, and various clinical names are used to distinguish them. Common, and representative, themes are suggested by these quotations: “I’m a hopeless sinner”; “The world’s going to the dogs”; “I’m the slickest guy in the world”; “The President is the Judas of mankind”; “The President is using death-rays on me.” Autistic thinking flourishes in greater or less abundance in every personality whose history is taken for any length of time. The somatic reactions at any given cross-section of the personality are striped muscle movements and tensions; heart and circulatory reactions; gastro-intestinal responses; skin adjustments; organic sexual behavior; respiratory, pupillary, and urogenital adaptations; inner glandular action on the biochemical balance of the blood; heat production (fever and certain metabolic alterations not included before); electrical conductivity; and immunological responses. Under the same environing conditions individuals show wide variations in physical behavior, and when these manifestations show certain gross deviations from norms, though no organic lesion can be shown to be present, the presumption is that the energy of some mental process has been converted into somatic form. This notion of hysteria (and what may be called hysteroid reactions) was classically formulated by Freud. Every individual who is closely scrutinized shows, from time to time, tendencies to urinate excessively (though no adequate physical explanation is apparent), to refrain from passing feces, or to suffer pains in the back or neck.