176 MAN --AN ADAPTIVE MECHANISM 



These studies, which have extended over a period of 

 six years, and have included the classification of over 

 one hundred thousand brain cells, show that in every 



A. B. 



Section of normal adrenal of cat. Section of adrenal of cat after injec- 

 tions of indol and skatol. 



FIG. 34. EFFECT OF INJECTIONS OF INDOL AND SKATOL ON THE 



ADRENALS OF A CAT. 



Note the widespread disappearance of cytoplasm and of nuclei in B. 

 (From photomicrographs, X 1640.) 



instance of exhaustion, except when the vitality had 

 been depressed by narcotics and anesthetics, identical 

 changes were produced in the same three organs the 

 brain, the adrenals and the liver. Whatever the cause of 



