MILK AS A FOOD 



To Supply Energy at Equal Cost 



143 



Fallacy of Theoretical Valuation. — While the con- 

 tents of protein and the ratio between digestible pro- 

 tein and fats and carbohydrates on one hand, and the 

 fuel or energy value on the other, have long been the 

 only recognized measures for food values, they are ad- 

 mittedly quite inadequate and in- 

 sufficient and although they are a 

 great help when used with discrim- 

 ination in making up food rations, 

 they are often abused by persons 

 who do not take their fallacies into 

 consideration. 



*' Something Unknown." — Recent 

 investigations by Dr. F. G. Hopkins, 

 of Cambridge, England, and Dr. E. 

 V. McCollum, formerly of Wis- 

 consin, now of the Johns Hopkins University, have 

 proven conclusively that one food ingredient cannot 

 always be substituted for another with impunity even 

 though the most searching chemical analysis shows 

 them both alike in contents and digestibility. There is 

 ^'Something Unknown" in certain foods — ^^Vitamines" 

 some call it — essential especially in promoting the 



Dr. E 



McCollum 



