┌────────────────┬──────────────────┬──────────────────┐ │ │ Is as cheap as │ │ │ Milk at— │sirloin steak at— │ Or eggs at— │ ├────────────────┼──────────────────┼──────────────────┤ │7 cents a quart │16.3 cents a pound│17.6 cents a dozen│ │8 cents a quart │18.6 cents a pound│20.1 cents a dozen│ │9 cents a quart │21.0 cents a pound│22.6 cents a dozen│ │10 cents a quart│23.3 cents a pound│25.1 cents a dozen│ │12 cents a quart│27.9 cents a pound│30.2 cents a dozen│ │15 cents a quart│34.9 cents a pound│37.7 cents a dozen│ └────────────────┴──────────────────┴──────────────────┘ According to this table, if milk is selling at 10 cents a quart, sirloin steak must sell as low as 23.3 cents a pound, and eggs at 25.1 cents a dozen to supply protein at equal cost. _To Supply Energy at Equal Cost_ ┌────────────────┬──────────────────┬──────────────────┐ │ │ Sirloin steak │ │ │When milk is— │ must not │ And eggs not │ │ │ be more than— │ 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. [Illustration: Dr. E. V. McCollum ]