PLATE 1 



Fig. A. Monkey 1, immediately after the second operation, after the recovery 

 of the right side, showing the paralysis on the left. Note the manner in which 

 the left hand is turned under and the left leg outspread. 



Fig. B. Monkey 1, after the second operation. The left arm is now being 

 used as a prop as the animal sits upright. 



Figs. C. and D. Monkey 1, after second operation, showing the ability of the 

 animal to use the right (recovered) hand for holding a strap which it is trying 

 to chew. In both illustrations the animal is shown after the strap had been 

 pulled upon so that the animal was irritated. Note the apparent helplessness 

 of the left arm and leg, both of which members are flaccid. 



Fig. E. Monkey 2, after the second operation. The left arm of the animal, 

 which has been just paralyzed, was accidentally caught in the strap which was 

 pulled upon to get the animal to sit upright. The right arm is bandaged to the 

 body. Note the utter helplessness, there being no effort to get the left arm out 

 from the restraining strap. 



Fig. F. Monkey 2, after the second operation. Note that the animal has now 

 recovered the ability to use the left hand and arm to a certain extent, since it 

 holds the strap. 



Fig. G. Monkey 2, after the second operation. Note that the animal now 

 uses its left hand and arm with apparent ease to support itself in walking. 



Fig. H. Monkey 2, 26 days after the second operation. The animal was pho- 

 tographed in the act of attempting to take hold of the irritating strap. Note 

 that the left arm is now used in a normal manner. 



Fig. J. Monkey 3, after the second operation. Note that the right side has 

 recovered, but that the newly paralyzed left is badly used. The left arm shows 

 wrist drop, and the small toe on the left foot is turned under. 



Fig. K. Monkey 4, after first operation, 26 days. Note that the right arm is 

 used well in holding to the strap and that the right leg takes a normal position 

 when the animal is sitting. 



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