118 



K. S. LASHLEY 



The lesions of the animals of the present series are described in 

 section III. 



Of the cases included in the table one (number 14*) must be 

 excluded because the brain was not sectioned, leaving eight sig- 

 nificant cases. Two lesions are common to seven of these eight. 

 They are destruction of the motor cortex and destruction of one 

 corpus striatum. Number 14 alone shows no injury to the corpus 



TABLE 9 



The character of lesions in animals showing paretic symptoms 



1 In the earlier description of this animal it was stated that the lesion passed 

 through the right corpus striatum. In regxamining the sections I find that the 

 cut passed along the external capsule laterad to the C. S., and produced at most 

 a very slight injury to it. 



striatum and his paresis is questionable (p. 120). These are 

 the only lesions common to all the paretic animals. Injury to 

 the motor cortex alone has been shown to be incapable of produc- 

 ing paresis. There remains only the injury to the corpus stri- 

 atum as a possible explanation of the motor disturbance. A 

 further fact points to the corpus striatum as the source of paresis. 

 In every case the paresis was on the side opposite the injured 

 nucleus, irrespective of whether the lesion to the stimulable cor- 



