THE KINETIC SYSTEM 



175 



first given heavy doses of opium, then traumatized, or 

 toxins, acids, strychnin and adrenin. 



A. B. 



Section of normal cerebellum of cat. Section of cerebellum of cat after 



injections of indol and skatol. 



FIG. 33. EFFECT OF INJECTIONS OF INDOL AND SKATOL ON THE BRAIN- 

 CELLS OF A CAT. 



Compare the Purkinje cells in B with those in A, noting the hypochro- 

 matisrn and the general appearance of disorganization in B. 



(From photomicrographs, X 310.) 



As a contrast to these studies histologic examinations 

 were made of normal animals ; of animals after long 

 .sleep woodchucks immediately after hibernation. 



