Redlich described the psychoses associated with cerebral growths as being epileptiform in character and origin and resembling post-epileptic psychoses in their symptomatology, with irritability, excitement or violence, confusion, delirium and hallucinations, often followed by partial amnesia. Epileptic manifestations may occur in the form of equivalents during the development of the growth. Bernhardt and Oppenheim have called attention to episodes of vertigo, irritability, excitement, clouding and occasional delirium with amnesia following intense paroxysms of headache. These attacks also strongly suggest the characteristics of epileptic psychoses. Nothnagel, Bernhardt, Oppenheim, Schuster, Ziehen and others attribute the mental symptoms associated with brain tumor to increased intracranial pressure producing an anaemia. Klippel, Maillard, Vigouroux, Kaplan and others believe that they are due to toxins originating in the growth. This view is based largely on the appearance of psychoses similar to the Korsakow syndrome. Knapp in 1906 called attention to the prominence of mental symptoms in growths occurring in the anterior portion of the corpus callosum. These may be associated with intellectual defects, apraxia, speech disturbances and stupor. Gianelli found mental disturbances in 209 of 318 cases examined. Kraepelin[195] attributes the mental symptoms of growths to an injury of the brain structure, changes in intracranial pressure, circulatory disturbances, and the absorption of toxic substances. A growth of considerable size but of slow development may permit of a readjustment of pressure, etc., and show few symptoms. On the other hand, a small neoplasm on account of its site or rapidity of growth may be accompanied by profound mental disturbances resulting from chemical irritation, obstruction of the aqueduct of Sylvius, or circulatory interferences. Kraepelin quotes Schuster (1902) as finding psychotic symptoms in all cases of growths in the corpus callosum, in two-thirds of those of the hypophysis, in one-third of those of the cerebellum and in one-fourth of the cases with involvement of the brain stem. These he looks upon as pressure symptoms except in the case of the callosal neoplasms. Schuster was of the opinion that growths in the cortex usually lead to actual psychoses and those in the deeper areas to dementia. He found a general mental deterioration in 423 out of a total of 775 cases of brain tumor. The patients were indolent, inattentive, clumsy, forgetful, dull, tired easily and lost more and more their capacity and inclination for sustained exertion. Thought, decision and mental processes generally, required an unusual amount of effort. The patients usually became somewhat confused and disoriented in regard to time, place and person, as well as incoherent in speech. In many cases there is a marked memory disturbance with a tendency to fabrication suggesting Korsakow's psychosis. Delirious states with hallucinations