INTRODUCTORY 45 



was due to an insufficient amount of vitamine B. Unfortunately, 

 these investigators failed to determine whether an addition of B- 

 vitamine would not stimulate milk secretion. Invariably, all of the 

 above mentioned workers stressed the possibility of finding a still 

 unknown vitamine, especially in milk. 



In conclusion we wish to mention that besides other possibilities 

 of clearing up the etiology of pellagra, we have already intimated 

 (I.e. 62) that there might be a specific antipellagra vitamine a view 

 held as well by Goldberger (109)'. This vitamine could be a sub- 

 stance easily adsorbed from animal protein as we pointed out on 

 page 43. Still, for these or for other conceptions of pellagra, no 

 real experimental evidence is at present available. 



After having discussed the definitely established types of vitamines, 

 we shall take up the vitamine requirements of various organisms. 



