PHYSIOLOGICAL CHEMISTRY 



The curve shown in Fig. 171, below, is the growth curve of a white rat fed as 

 just described. 1 



The rat pictures reproduced in Figs. 172 and 173 also show the influence of 

 Water-Soluble B in the diet. The animals each weighed about 50 grams at the 

 beginning of the experiment. At the end of a few weeks, the rat (No. 4) re- 

 ceiving an inadequate supply of this vitamine showed no gain in weight, whereas 

 the other animal (No. 14), receiving a more adequate supply of this growth- 

 promoting substance weighed 115 grams. 



G/vm 



X 



171. GROWTH CURVE OF ALBINO RAT SHOWING 

 IMPORTANCE or WATER-SOLUBLE "B". 



FIG. 

 (Hawk, Fishback and Bergeim: American Journal of Physiology, 48, 211, 1919.) 



An experiment similar to the above may be made by replacing the casein 

 by "meat powder" prepared from fresh lean beef, ground and dried in a current 

 of air at about iooC. A typical growth curve from such an experiment 2 is 

 shown hi Fig. 174, page 586. 



1 Hawk, Fishback and Bergeinf: American Journal of Physiology, 48, 211, 1919 See 

 also Osborne and Mendel: Jour. Biol. Chem., 31, 149, 1917; 32, 309,1917; Funk and 

 Macallum: Jour. Biol. Chem., 23, 413, 1915; 27, 51, 1916. 



* Osborne and Mendel: Jour. Biol. Chem., 32, 309, 1917- 



