g6 Journal of Comparative Neurology. 



locates the hind-leg rei^ion behind the " crucial sulcus " about 

 at the point devoted by Cunningham to the flexion of the toes 

 of the fore foot. He adds however that this region is less easi- 

 ly excitable than the others. Ziehen is also struck by the fact 

 that his results reverse the relation between the fore and hind 

 leg regions as compared with the rodents and insectivora. On 

 the other hand, our own results, so far as they go, are in har- 

 mony with what we know of other groups, although this method 

 of localizing the cortical areas is, we believe, open to grave ob- 

 jections from the theoretical as well as the practical standpoint. 

 It is no unusual thing for an animal that seems to be fully under 

 the influence of the narcotic to respond in the most distinct and 

 apparently localized manner to stimuli at the most unexpected 

 points, as a result probably of general irritation. An illustra- 

 tion of this is afforded by the raccoon brain of figure 2. The 

 cortical area indicated on the right side was first extirpated. 

 Before recovery from the narcosis there was a tendency to ro- 

 tate toward the right, i. e., the side of the injury. After re- 

 covery the animal seemed quite blind on the opposite side. He 

 would snap at a stick or flinch from a threatening blow when 

 wnthin the field of the right eye, but quite ignored the same 

 movements on the other side. A day later there seemed to be no 

 irritation and the pupil reflexes were normal. The loss of sense 

 of touch of the left fore leg was quite evident, though hard to 

 differentiate because of the loss of vision. Subsequently the 

 left hemisphere was exposed and stimulation experiments were 

 attempted in the usual manner but which proved quite uncer- 

 tain. Nevertheless, the areas in which are found the points 

 numbered i, 4, 8, and 13 presided over the motions of the hind 

 leg and foot. This area is somewhat farther caudad than the 

 hind leg area described in the raccoon in the experiments quoted 

 above but in the same general region. Regions further laterad 

 both in front and behind the area mentioned occasioned mo- 

 tions of the fore foot and leg. 



Fig. 3 gives a few data from stimulation experiments with 

 a kitten. Here points 4 and 5 are devoted to the hind leg, 3 



