44 ROBERT OGDEN AND SHEPHERD IVORY FRANZ 



trates the condition of the left hemisphere. The microscopic examina- 

 tion has not been made at this writing, but the gross appearance shows 

 that most, if not all, of the arm and leg areas of the left cortex had 

 been destroyed. The precent'al area which showed destruction is 

 shown in the diagram by horizontal lines. Behind the central fissure 

 there is anobher area (post-central and intermediate post-central, ac- 

 cording to Campbell's histological differentiation) which appears to be 

 affected. This area may have been involved because of changes in the 

 blood supply in the application of the cautery to the precentral cor- 

 tex, although it is not possible to determine the matter until the brain 

 has been examined histologically. It also appears from the gross 

 examination that some of the uppermost part of the leg area may have 

 escaped destruction because of its proximity to the longitudinal sulcus, 

 but this also cannot. be definitely determined until the results of the 

 microscopical examination are available. It has previously been noted 

 that the cautery was pushed into the brain so as to destroy the parts 

 not usually accessible, and it may be that the superficial normal appear- 

 ance will not be borne out by further examination. 



Summary. Monkey 4 was made hemiplegic on the right side, and 

 after three weeks, treatment of the arm and leg muscles, and by com- 

 pelling the animal to use the right side, it became able to use the 

 right arm and leg as well as a normal animal. The brain showed ex- 

 tensive destruction of the precentral area on the left, with a possible 

 complication of the post-central area on the same side. 



GENERAL SUMMARY AND DISCUSSION 



The seven cases of hemiplegia in the four animals were treated 

 in different ways in order to determine some of the conditions 

 favorable to the recovery of voluntary motor function. The 

 second experiment shows that motor recovery after the pro- 

 duction of an hemiplegia does not result if the animal is left to 

 its own devices, and this management (or lack of management) 

 it is almost unnecessary to remark is what is given to most human 

 paralytic cases. Even though the animal be prevented from 

 using the sound (unparalyzed) segments there is little difference 

 in the improvement from that in which no treatment is given 

 unless in addition to the limitation of the possibility of move- 

 ment there be added some extra stimulation to the muscles 



