THE KINETIC SYSTEM 



175 



first given heavy doses of opium, then traumatized, or 

 given toxins, acids, strychnin and adrenin. 



Section of normal cerebellum of cat. 



B. 



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- 

 matism 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. 



