Fourth:--Paranoid degenerative forms. This group he again subdivides into the querulent and hallucinatory paranoid forms. The former may resemble the typical "Querulantenwahn", a psychosis artificially built up out of extraneous circumstances, and one which rarely develops in freedom, but is of very frequent occurrence in prison. The hallucinatory paranoid form consists of fallacious sense perceptions and delusions of a persecutory nature, often substantiated by a strongly hypochondriacal element; in short, a picture which simulates very closely the real paranoid state. Fifth:--Prison psychotic states with simulated symptoms. Sixth:--Dementia-like processes. The individuals belonging to this group are habitual criminals in whom the criminal tendencies become evident at a very early period in life, and who, without giving distinct evidence in their past history of a mental disturbance, develop after prolonged confinement a progressive change of character which eventually leads to frequent rebellious outbreaks against the prison management. They become absolutely unmanageable, neglect their work and duties, and finally have to be transferred to an insane asylum. Here they show nothing characteristic of the well-known dementing processes, as hebephrenia, for example; but very frequently, although quite young, their entire manner and behavior suggest a certain dilapidation and deterioration. Siefert considers the above-mentioned disease processes as entirely dependent upon and provoked by prison life, in individuals with a tendency to mental deterioration. He comes to the conclusion that the prison psychoses are reactions of pathologic nervous organizations to definite deleterious conditions of life. They are nothing more than irradiations, distortions, and new creations, on the same degenerative soil which also conditioned the crime. The importance of Siefert's momentous work cannot be doubted, but whether he was justified in his many subdivisions of the degenerative states is questionable. His own description of the various forms immediately suggests the difficulty of clearly differentiating one from the other.