The disorder itself, as far as the symptomatology is concerned, is not absolutely typical of any one of the acute psychogenetic states. It partakes of Kutner's "catatonic states in degenerates" as well as Raecke's confusional hallucinatory disturbances in these individuals. That the patient can be classed as one having a degenerative soil is not at all certain in this case. I have considered briefly the importance of a proper recognition of these cases from the viewpoint of rendering a proper prognosis. There is another important question which must be discussed in connection with these cases and that is the question of malingering. Picture to yourself an individual, who, to all appearances, has led a normal existence, and never showed anything mentally which might be considered pathologic. He commits a crime, and upon being arrested or upon being placed on trial for his offense, suddenly lapses into a condition of apparently complete dementia. The man, who formerly showed nothing in his conduct and behavior indicative of a mental disorder, suddenly changes into a state where he does not know his name, age, or his whereabout. His answers to questions are irrelevant and of a remarkedly silly coloring. He begins to act in a childish, affected manner, executing many silly, meaningless acts, or he may break out in a wild furious excitement, loudly proclaiming his innocence, and threatening those who arrested him. In addition to this, it is noted that this apparently pathologic condition can be definitely influenced by using strict and positive measures. The untidy habits of the patient may be corrected by urging or threats. The man who has been mute and refuses to eat can be made to talk and eat voluntarily by threatening him with tube-feeding. Furthermore, in the midst of this apparently total dementia, total blocking of all thought processes, the patient frequently surprises those about him by very sensible remarks of a very clever and pertinent nature, indicating that although apparently oblivious of his environment, he knows what is going on about him. A picture like this may readily arouse the suspicion that we are dealing with a malingerer, and, indeed, some very prominent German psychiatrists have reported as malingerers cases similar to this. The trained psychiatrist, if unfamiliar with this class of cases, will find himself at a loss to know under what known group of mental disorders to place this condition, as it will at once become apparent to him that it does not fit into any of the well-known psychoses.