MILK AS FOOD 



369 



the middle period of lactation about 0.5 per cent. Cows' milk at 

 the middle of lactation contains about 0.3 per cent. 



It is usually stated that one quart of milk is about equal in food 

 value to any one of the following : 



Salt codfish 2 pounds 



Fresh fish .... 3 pounds 



Chicken 2 pounds 



Beets . . 4 pounds 



Turnips. 5 pounds 



Butter . . i pound 



Wheat flour . . . . \ pound 



Cheese .... ^ pound 



Lean round beef . . . . f pound 



Potatoes .2 pounds 



Spinach .6 pounds 



Lettuce 7 pounds 



Cabbage 4 pounds 



Eggs .... 8 pounds 



TOTAL , 

 SOLIDS 



WATER 



FAT 



SOLIDS 



HOT 

 TAT 



FIG. 44. -Composition of cow's milk, showing variations. (Report on milk 

 investigation, Boston Chamber of Commerce, 1915.) (MacNutt, The Modern 

 Milk Problem.) 



This, however, considers milk only from the total calories yielded. 



Digestibility and assimilation must be considered as well as chemical 



composition and caloric value; when this is done milk ranks even 



higher than suggested by the foregoing. Moreover, milk has other 



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