38 BIOLOGICAL PROBLEMS 



the anti-neuritic substance, because in its absence 

 nervous symptoms display themselves, is present in 

 the outer layers of the wheat berry and also in the 

 embryo, but not in the white endosperm. This dis- 

 tribution has been thoroughly established by the 

 careful work of Dr. Harriette Chick and her co- 

 workers. 



Bread, it is true, is not eaten alone. A sufficient 

 supply of vitamines may be forthcoming from the 

 other constituents of a mixed dietary. In determin- 

 ing the milling policy of the future this particular 

 deficiency of the pure white loaf must not, however, 

 be left out of account. 



F. G. H. 



