One of the most important contributions to the literature of traumatism as associated with psychoses was made by Adolf Meyer[151] in 1903. Notwithstanding the statements of such observers as Savage, appearing as late as 1905, he expressed the opinion that traumatism and general paresis are not directly related except that injuries may rarely act as precipitating factors. He does not expect to find psychoses resulting from small lacerations or other similar lesions in the cortex. As a result of his observations Meyer[152] described the following forms of traumatic disorders:— 1. The direct post-traumatic deliria with the following subdivisions: a. Preeminently febrile reactions; b. The delirium nervosum of Dupuytren, not differing from deliria after operations, injuries, etc.; c. The delirium of slow evolution of coma, with or without alcoholic basis; d. Forms of protracted deliria, usually with numerous tabulations, etc. (with or without alcoholic or senile basis). 2. The post-traumatic constitution: a. Types with mere facilitation of reaction to alcohol, grippe, etc.; b. Types with vasomotor neurosis; c. Types with explosive diathesis; d. Types with hysteroid or epileptoid episodes, with or without convulsions (such as most reflex psychoses); e. Types of paranoic development. 3. The traumatic defect conditions: a. Primary defects allied to aphasia; b. Secondary deterioration in connection with epilepsy; c. Terminal deterioration due to progressive alterations of the primarily injured parts, with or without arteriosclerosis. 4. Psychoses in which trauma is merely a contributing factor: a. General paralysis, with or without traumatic stigmata; b. Manic-depressive and other transitory psychoses, catatonic deterioration and paranoic conditions, with or without traumatic stigmata. 5. Traumatic psychoses from injury not directly affecting the head.