CEREBRAL MOTOR CONTROL 35 



were cortical, and entirely so as far as this could be done. It will 

 be remembered that most of the hemiplegia-producing cerebral 

 hemorrhages in man are in the lenticulo-striate region, the cere- 

 bral insult producing in those cases interferences with or de- 

 structions of the pyramidal fibers. The lesions also differed 

 from many in man in that in man a hemorrhage may act by 

 pressure to produce a temporary alteration in conductivity or 

 irritability which simulates the effect of destruction. This altera- 

 tion in conductivity or irritability may partly or wholly dis- 

 appear when the clot becomes organized or is absorbed. Since 

 there is no regeneration of the cellular elements the experi- 

 mental destruction may be regarded as the more complete and 

 the more satisfactory. 



Information regarding the methods of dealing with the ani- 

 mals are given in the brief accounts of the observations which 

 follow. The post-operative management of the cases differed in 

 order that the value of different procedures might be determined. 

 Each animal was operated upon under a general anesthetic, 

 and the later feeding and care was the same for all, except in 

 those cases when it became necessary to feed the animal by 

 hand. 



Experiment 1 



Monkey 1. Before operation this animal appeared to be right- 

 handed, although the observations were not sufficient in number to 

 make this perfectly certain. It was normal and lively. The left 

 motor cortex was cauterized May 30, 1916. The animal was then ob- 

 viously hemiplegic on the right side, the paralysis extending to the 

 face as well as to the arm and leg segments. The right arm and leg 

 were flaccid and the right side of the face drooped. The animal could 

 not feed itself with the right hand and arm. 



Management and results. The left (normal) arm was strapped to 

 the trunk by means of a jacket so constructed that the arm could not be 

 used for any of the important operations of feeding and climbing. The 

 left leg could not be hampered in the same manner although it was 

 thought to be desirable. The object of the restriction was to compel, if 

 possible, the animal's use of the corresponding paralyzed segment. In 

 addition to this passive method of treatment, efforts were made to get 



