Statistics show an appalling incidence of head trauma. The subject of the changes in the brain and the symptoms resulting from head injuries is coming to be most important in modern medicine. The courts are deluged with cases in which compensation and redress are sought because of claims of permanent sequelae as the result of alleged injuries to the brain. The subject is further complicated by the fact that neurologists and neurosurgeons are still at odds concerning the question of the organic or functional nature of many of the symptoms. The clinical evidences of brain trauma during the acute period require no lengthy descriptions. It is well known that the duration of unconsciousness is usually in direct proportion to the severity of the brain injury, although this does not always prove an accurate estimate, since complications, such as hemorrhage, can increase the duration of loss of consciousness. General shock is