440 PHYSIOLOGY CHAP. 



When the dog with half a cerebellum has succeeded, after 

 repeated attempts, in avoiding falling to the injured side by 

 appropriate compensatory acts, it also becomes able to avoid 

 forced circus movements towards the healthy side in swimming ; 

 it is able to keep to a straight line, and to turn towards the 

 operated side. For this purpose it adopts the same device in 



FIG. 233. Tracings of the gait of a bitch weighing 5150 grms. after complete extirpation of the 

 right half of the cerebellum. (Luciani.) 6, tracing taken two months after the operation ; 

 c, over a year from the operation ; d, after a year with eyes bandaged ; e, after a year when the 

 animal had previously received morphia. 



swimming as in walking, that is, curvature of the vertebral 

 column towards the defective side, which enables it to use the 

 lumbo-sacral part of its trunk as a rudder. It compensates the 

 stronger action of the limbs of the sound side by an appropriate 

 degree of vertebral curvature, and swims in a straight line or even 

 turns towards the defective side. 



One of the main results of our studies on the cerebellum is 

 that we have shown it to be possible, and even easy, to separate 

 the phenomena of cerebellar deficiency from the phenomena of 



