A brief mention of renal disease in the general etiology of mental disease is made by Ballet.[12] Ballet states that Griesinger's opinion that renal disease had little importance in the etiology of mental disease and that no one would count the cerebral symptoms of Bright's disease as mental is no longer held. Ballet enumerates a number of works upon so-called folie brightique which tend to prove that acute or chronic Bright's disease gives rise either to melancholic disorder or alternately to maniacal and melancholic disorder. How the mental disease is produced is doubtful. Ballet holds that all the various psychopathic disorders resulting from Bright's disease are autotoxic. Renal disease like heart disease is only capable of awakening a latent predisposition or liberating a constitutional psychosis, unless it is merely effecting a species of intoxication. It cannot be doubted that the relation of kidney disorder to mental disorder is worth intensive study, of which the present communication is merely a fragment. Progress will be of course impeded by the fact that upon microscopic examination, practically all cases of mental disease coming to autopsy show renal disease of one or other degree; in fact, it is perhaps possible to show a higher correlation of renal disease with mental disease than of brain disease to mental disease. Perhaps something can be obtained if we limit ourselves to a study of cases with pronounced somatic renal symptoms and signs, cases with the renal facies and the like. As to the question of phthisis and mental disease, Ziehen remarks that the tuberculous are often observed to be optimistic but that other cases show a hypochondriacal depression with egocentric narrowing of interests. He speaks of a sort of rudimentary delusional disorder looking in the direction of jealousy in certain cases. Pronounced mental disorder occurs rarely in tuberculosis, according to Ziehen, and leads either to melancholia or to hallucinatory states of excitement, resembling the deliria of exhaustion or inanition. Acute miliary tuberculosis may produce the impression of a general paresis or of an amentia in Meynert's sense. The inanition delirium of tuberculosis resembles that of carcinosis and malaria. Kraepelin regards tuberculosis as of very slight significance in the causation of insanity, despite the fact that slight changes in mood and in voluntary actions frequently accompany the course of the disease. Irritability, depression and sensitiveness, incomprehensible confidence and desire to undertake various tasks, pronounced selfishness, sexual excitement and jealousy are the traits of mental disorder in tuberculosis. Kraepelin states that many cases of tuberculosis show traits of alcoholic disease and says that the occurrence of polyneuritic forms of alcoholic mental disorder is favored by the association of tuberculosis with alcoholism. Wernicke does not systematically consider the topic.