VITAMIN G (82) 147 



ten times richer than muscle in vitamin G, whereas it was found to be 

 200 to 400 times richer in vitamin A. 



Other Factors 



That other factors are operative in the phenomena of mammalian 

 nutrition which may soon be fully recognized as seventh, eighth and 

 perhaps ninth (or more) mammalian vitamins now seems highly prob- 

 able in view of the work of Coward et al. (1929), Hunt (1928b), 

 Palmer and Kennedy (1928-29), Sherman and Stiebeling (unpub- 

 lished data of 1930), Peters (1930), Reader (1929a, 1930), and others. 

 Development of knowledge in this direction may soon permit of better 

 interpretation of much of the work upon vitamins B and G. 



