MULTIPLE sclerosis has been a subject of great importance and wide research in neurology during recent years. Much attention has been given to geographic and racial conditions, as well as to the etiologic, pathogenic, symptomatologic, and therapeutic study of the disease. I have studied multiple sclerosis in Turkey with consideration of the two former factors and, besides this, have compiled the etiologic and symptomatologic statistics on 410 cases that were collected from most of the larger hospitals. The present medical publications indicate that multiple sclerosis exists in almost every country and no race is completely immune to it. Only in some geographic zones and among some races is there a striking difference in regard to the proportion of afflicted persons. In the statistics which were made in Boston1and in Greater New York,2the incidence of multiple sclerosis for the white population was found to be about 4.3