CHARTS AND THEIR EXPLANATIONS. 



*33 



Chart CXX. 



Chart CXXI. 



Day-s 



Charts CXX (rat 208, female) and CXXI (rat 206, female) show, in period 

 1, failure to grow on the diet indicated below; and, in period 2, nearly 

 normal growth on a diet containing protein-free milk in which one-quarter 

 of the gliadin, previously found inadequate to induce growth, was replaced 

 by casein. Note the small quantity of casein which suffices to promote 

 growth instead of standstill. This emphasizes the different nutritive 

 value of casein and gliadin. The diets consisted of 



Chart CXXII. 



80 100 



Days 



Chart CXXII (rat 179, female). Period 1 shows maintenance without 

 growth on a diet containing salt mixture I (no protein-free milk) and casein 

 as the sole protein. This should be contrasted with numerous similar experi- 

 ments in which the inorganic constituents of the diet were present in the 



