228 MAN --AN ADAPTIVE MECHANISM 



There is a strong resemblance between certain aspects 

 of Graves' disease, of iodism, of emotion and of infec- 

 tion. The likeness between Graves' disease and all 



A. B. 



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



infection. 



FIG. 51. EFFECT OF INFECTION (STREPTOCOCCAL) ON THE BRAIN-CELLS OF 



A CAT. 



Note the marked disintegration of the Purkinje cells in B. 

 (From photomicrographs, X 310.) 



types of excessive emotion is not surprising in view 

 of the frequency with which the disease is traced to a 

 nervous origin. For of all activating stimuli re- 

 sponsible for Graves' disease, chronic emotional activa- 



