secretly active in plotting and scheming against him, the accused. In this artificially created world he lives with comparative ease, and has thus succeeded in reaching a proper adjustment to the situation. The most interesting part of it all is that this so well-organized and apparently fixed delusional system may disappear at once and the various false ideas may become entirely corrected as soon as the provocative agent which is at the bottom of it all is removed. This is a fair example of what has been termed an acute prison psychosis, and occurs with considerable frequency among prisoners awaiting trial. Naturally, these psychoses, being, as they are, psychologically motived, are extremely variable in their manifestations, but at the root they are all alike and impress the observer as something entirely different from the pure endogenous mental disorders. They are all psychically evoked reactive manifestations of a particularly predisposed constitution to definite deleterious environmental conditions. Some of the cases reported in the first paper of this series are good examples of this type of mental disorder. We owe our knowledge of these disorders to the contributions of Reich, Moeli, Kutner, Ganser, Rish and others, authors who, although describing a more or less identical symptom-complex, have given to it different names, such as hysterical stupor, Ganser symptom-complex, catatonia of degenerates, etc. The distinguishing features of this disorder are its psychic origin, that is, its development in consequence of some strongly affective experience, and its high grade of impressionability to things in the environment which may at any time suddenly cause a complete transition from deep stupor to normal manner and behavior. The symptomatology consists of an acute delirioid, hallucinatory episode, usually followed by a more or less complete amnesia which may go back far enough to include the experience which provoked the disorder. Such delusional formation as takes place after the disappearance of the fulminant symptoms may well be considered as part of the repair process, a mechanism which in most instances reflects the individual's endeavor to adjust himself to an unpleasant, unbearable situation, and must not be looked upon necessarily as an indication of the progressiveness of the disorder. As we have stated before, complete correction of all delusional ideas may suddenly take place upon the removal of the causative factor at the bottom of the entire situation. As to the treatment of this acute prison psychotic complex theoretically, we should have no difficulty in deciding this question. We are dealing with the sequelæ of some definite situation, and the removal of that situation may be, and actually is, in most instances, sufficient to bring about recovery. When we come, however, to deal with concrete instances in daily practice, the problem does not lend itself so easily to solution.