Page:The story of milk.djvu/169

 To Supply Energy at Equal Cost

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 * When milk is—  |Sirloin steak must not be more than—|And eggs not more than—|
 * 7 cents a quart |          9.9 cents a pound          |       9.3 cents a dozen|
 * 8 cents a quart |         11.3 cents a pound          |      10.6 cents a dozen|
 * 9 cents a quart |         12.8 cents a pound          |      11.9 cents a dozen|
 * 10 cents a quart |        14.2 cents a pound          |      13.2 cents a dozen|
 * 12 cents a quart |        17.0 cents a pound          |      15.9 cents a dozen|
 * 15 cents a quart |        21.3 cents a pound          |      19.8 cents a dozen|

Fallacy of Theoretical Valuation.—While the contents of protein and the ratio between digestible protein 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 admittedly quite inadequate and insufficient and although they are a great help when used with discrimination in making up food rations, they are often abused by persons who do not take their fallacies into consideration.

Dr. E. V. McCollum

"Something Unknown."—Recent investigations by Dr. F. G. Hopkins, of Cambridge, England, and Dr. E. V. McCollum, formerly of Wisconsin, 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