METABOLISM 



FIG. 175. RAT FED A DIET DEFICIENT IN FAT-SOLUBLE A (LEFT) AND RAT FED AN ADE- 

 QUATE DIET (RIGHT). 

 (From McCollum "The Newer Knowledge of Nutrition.") 



c* 



m 



clays 



20 



4O 



60 



80 



/OO 



FIG. 176. THE FAT-SOLUBLE VITAMINE AND GROWTH. THE DIET CONTAINING LARD 

 WAS DEFICIENT IN FAT-SOLUBLE A, WHILE COD LIVER OIL, BUTTER FAT, AND EGG YOLK 

 FAT ARE RICH IN THIS SUBSTANCE. 



(Osborne and Mendel: Journal of Biological Chemistry, 16, 434, 1913; 17, 405, 1914.) 



