Poliomyelitis, commonly known as Infantile Paralysis, is an acute infectious disease, accompanied in many, perhaps most cases, by paralysis. The paralysis is incidental and not essential, and when it occurs, is a weakening or total loss of power in certain muscles, with no gross disturbance of sensation. Infantile Paralysis is a general infection, the results of which are most marked in the nervous system, in which at autopsy the meninges are found to be edematous and injected, a slight increase in the amount of cerebrospinal fluid also being evident. The brain and cord are edematous and minute hemorrhages can generally be distinguished.