CEREBRAL MOTOR CONTROL 39 



monkey used the left hand exclusively for all operations. The right 

 hand showed marked wrist drop, there was very little strength in either 

 flexion or extension of the fingers, and the whole arm segment had not 

 advanced much towards recovery during the period of the treat- 

 ment. The leg showed a similar condition. There was a dragging of 

 the foot when the animal crawled or attempted to walk over the floor, 

 and the foot and leg could not be used with any facility for climbing or 

 other kinds of operations which a normal monkey performs. It was 

 evident, however, that gome improvement was taking place, and that 

 there would be a recovery in time seemed to be a justifiable conclusion. 

 Summary. General massage for twenty-six days of the paralyzed 

 segments of an hemiplegic monkey did not bring about a recovery of 

 motor ability, although there was some evidence of returning function, 

 much more than that found in monkey 1 after six months' "laissez 

 faire" treatment. 



Experiment 4 



Monkey 2. At the time of the second operation on this animal it 

 was in the condition just described. The second operation was the 

 cauterization of the right motor cortex on June 28, 1916. This resulted 

 in a complete paralysis of the left side with characteristic flaccid 

 condition of the arm, face and leg. 



Management and results. The right (not completely recovered 

 paralyzed) arm was bound closely to the body and only the left arm could 

 be used by the animal for the purpose of feeding and climbing about 

 its cage. In addition, active movements of the extensor muscles were 

 invoked by mechanical stimulation, and massage was used for the 

 muscle groups and for the nerves. The conditions of treatment were 

 the same as in the first experiment with monkey 1. 



The results of this treatment for twenty-six days were evidenced 

 by great activity on the part of the animal, by its ability to use the 

 newly paralyzed segments, and the movements could not be said to be 

 different from those of a normal animal. The movements are accu- 

 rate and of good force, and the animal dominated monkey 3 which had 

 been in the same cage with him for some time. He now uses his legs 

 very well in walking, he jumps more accurately than the other two 

 animals which still survive, and he is very much more active. There 

 is an apparent preference for the use of the left hand in feeding, but 

 when food is withheld until the animal uses the right hand for grasping 

 it, it is seen that the right is used apparently equally well. At the 



