IX 



MID- AND INTER-BRAIN 



519 



tonic contracture of the left limbs. If the left hind-leg is passively 

 stretched, it remains extended while the right goes back to its 

 former position. The animal lies on the left side. 



An hour and a half after the operation the animal lies in the 

 position shown in Fig. 259, with its head turned to the left between 

 the two hind-limbs which are extended forwards. The right fore- 

 leg makes constant swimming movements; the left limbs are 

 motionless. 



The animal keeps up this forced position during the first three 

 days after the operation. The myosis diminishes, the nystagmus 

 ceases. Both motility and sensibility are greatly diminished on 

 the left, and it is necessary to feed the animal artificially. 



On the seventh day the animal makes attempts to stand but 



FIG. 259. Forced curvature in cat to the left, after section of right side of mid- 

 brain and cerebral peduncle. (Probst.) 



falls to the left. The left limbs are paretic and anaes- 

 thetic, and are only moved reflexly. The two pupils 

 are equal and react to light. 



On the ninth day the animal begins to walk in a circular 

 direction to the left, but falls after a few steps. It begins to 

 support itself also on the left fore-leg, and can now turn its head to 

 the right. 



On the eleventh day it can walk for a short distance, leaning 

 against the wall. 



On the thirteenth day it walks better, but always in a circular 

 direction to the left ; it frequently crosses its fore-limbs. It has 

 regained the sensibility of the left limbs ; but does not correct the 

 abnormal position assumed by these limbs. It eats spontaneously. 



On the twentieth day it still presents circus movements to the 

 left, but is able to jump off a chair. When called, it can turn its 

 head to the right, but still keeps up the forced position of the head 

 to the left. 



