Bonhoeffer,[10] in a monograph devoted to the subject, endeavors to establish the existence, on the basis of degeneracy, of acute psychotic processes which do not belong to either the manic-depressive, hysterical, or epileptic temperaments, which cannot be placed under any of the known forms of dementia præcox, and which develop as wholly independent psychotic manifestations in particularly predisposed individuals. The material which served for his thesis was gathered from the Berlin Observation Ward for Criminals, among the inmates of which institution he found a great number of degenerative psychoses. In a recent work on the subject of psychogenesis he upholds his former views, and believes he has been able to separate his cases into three distinct groups. The first group comprises certain unstable individuals who show a tendency to the development of simple paranoid psychoses. It concerns patients of a very labile make-up with increased affective reactions, with marked tendencies to impulsions and antisocial acts. These cases are characterized by the fact that they do not concern psychogenetic psychotic exaggerations of a certain temperamental predisposition, but psychically evoked disease states which appear to be irreconcilably opposed to the original personality. He calls attention to the epileptic seizures of these individuals, which have been so ably described by Bratz.[11] In contradistinction to the genuine endogenetic epilepsy, these patients manifest epileptic seizures as reactions to situations purely psychic in nature. In them, without ever resulting in epileptic dementia, there occur along with the epileptic seizures attacks of unconsciousness, of excitement, dream states, and porio-maniacal outbreaks. They differ from the genuine epilepsy by the absence of the characteristic dementia, of attacks of _petit mal_, and by the fact that the seizures are never purely endogenous in origin. They are always due to extraneous causes, eminently such of a psychic nature. He believes that more frequently even than actual epileptic seizures are the dream states, excitements, and maniacal outbreaks brought about in these individuals by emotional experiences, and as a result of certain ideas and concepts. He places in this group the proverbial "wild man", the man who goes into a frenzy upon seeing a policeman, etc. Although alcohol may in these individuals prepare the way, the immediate causative factor, however, is the emotional experience, or the recollection of such an experience.