361 



tinually for a term of years, or undertake a journey of indefinite length on 

 foot through a tunnel not quite high enough to stand upright in, you will 

 get an idea of the feeling." 



In Figs. 4 and 5 I have indicated the location of the areas affected as 

 described to me by Mr. Laxton. These areas range from a "dull sensation" 

 to "very marked" and "maximum." It is interesting to note that the dis- 

 turbance becomes more and more marked toward the feet. That while 

 there is a great disturbance in all the toes of the right foot, this disturb- 

 ance increases from the little toe and the center of the bottom of the foot 

 to the hallux, where it is maximum. 



One observes, also, that with the exception of a small area on the 

 bottom of the left foot, which is very slightly affected, the disturbed areas 

 lie wholly on the right side of the body. This we would naturally expect, 

 as the greater part of the depression is on the left side of the median line 

 of the skull. Since the depression extends slightly across to the right of 

 the median line, we would expect some disturbance on the left side of the 

 body. The slight disturbance on the bottom of the left foot would indicate 

 that the portion of the brain close to the median line controls the center 

 of the foot. We would expect a greater disturbance in the corresponding 

 part of the right foot, because the corresponding area of the brain lies 

 more nearly under the center of the depression. 



We may, I think, reasonably infer that the region of greatest dis- 

 turbance is controlled by that part of the brain lying under the center of 

 the depression. Therefore the motor area controlling the movements of 

 the great toe would lie about the center of the depression, and that of the 

 small toes and the center of the bottom of the foot, in close proximity. 

 As we have already concluded that the cortical area controlling the center 

 of the bottom of the foot lies adjacent to the median longitudinal fissure, 

 that for the small toes would be farther removed from this region than the 

 center for the great toe. I think we may also conclude that the parts less 

 and less affected are controlled by portions of the brain lying nearer and 

 nearer the margin of the depression. The movement of the hair near the 

 anterior margin producing a tremor in the calf of the right leg, would in- 

 dicate that the motor center for this region is at this point. 



Since all the muscles of a given region, i. e., thigh or calf of leg, are 

 not equally affected, one may infer that different muscles of the same re- 

 gion may have somewhat widely separated centers of control in the cortex. 



