GROWTH AND CHEMICAL PURITY 271 



ficiency of the overfed is patent to every one. It is 

 an interesting fact also, as shown by Du Bois, that 

 protein injection does not produce increased calories 



B. 



Section of normal liver of dog. Section of liver of dog after injection 



of peptone. 



FIG. 67. EFFECT OF PEPTONE (PROTEIN) ON THE LIVER OF A DOG. 



Note the disappearance of cytoplasm, the disappearance of some nuclei 

 and the irregular shapes of others in B. 



(From photomicrographs, X 1640.) 



in the presence of fever, as would be expected. The 

 reverse would be as improbable as it would be for 

 an engine to blow off steam while it is struggling with 

 a heavy overload. 



