VIII 



THE HIND-BKAIN 



449 



exaggerated horizontal oscillations. It can easily be understood 

 that if the animal's trunk is inclined to the left and the centre of 

 gravity displaced to that side, while the right fore-limb is raised, 

 then, in order to recover equilibrium, the limb must be put down 

 obliquely to the left, so that it crosses with the leg of this side ; 

 the contrary must take place if while the left leg is raised the 



FIG. 235. Tracings of gait of a bitch weighing 5 ( J75 grms. in which the cerebellum had been almost 

 completely removed by three operations. (Luciani.) b, tracing obtained two and a half 

 months after final operation ; c, eleven months after ; c', the same with eyes blindfolded. 



trunk is suddenly inclined to the right while the left leg is raised. 

 This interpretation is confirmed by the fact that crossing of the 

 fore-limbs almost always occurs when the animal tries to alter its 

 direction, as shown by the tracings, of the footprints (Fig. 235). 

 In this case it curves its cervical spine to the right or left, so that 

 the left fore-limb crosses with the right, or the right fore-limb 

 with the left, to avoid loss of equilibrium and the danger of 

 falling. 



So that when in the decerebellated animal there is a marked 

 VOL. in 2 G 



