FOODS 85 



hours. The cream rises in a more coherent layer (50 to 60 

 per cent of fat). 



Condensed Milk. Consists of unsweetened milk or 

 sweetened milk or sweetened skimmed milk, concentrated 

 by evaporation, usually to one-third of its volume. The 

 addition of two volumes of water should, therefore, produce 

 a strength equal to the original. 



The unsweetened milks are well prepared, keep well, and 

 contain the due proportion of fat. 



The sweetened milks form the largest class, and for the 

 most part are good. The dilutions recommended in 

 nearly every case produce a milk very much below the 

 standard of ordinary milk. Such milks usually contain 

 rather more cane sugar than milk solids. For example (a 

 good specimen) : Fat 11 per cent, proteins 10 per cent, 

 milk sugar 14 per cent, ash 2-2 per cent, and cane sugar 

 38 per cent. (Solids not cane sugar, 11 + 10 -f- 14 = 35 

 per cent.) 



The sweetened skimmed milks, 'or separated milks, or 

 machine-skimmed milks, are very inferior to the above, 

 containing as little as 0-2 per cent of fat, and generally 

 about only 1 per cent. Such milk is unfit for the sole 

 nourishment of children ; and it would be better if such a 

 statement had to be put on the label. 



Analysis. Mix the contents of the tin well, weigh out 

 10 grm., dissolve in water, and make up the bulk to 

 100 c.c. Analyse as in the case of ordinary milk, except 

 that for fat the Werner-Schmidt method is inapplicable in 

 sweetened milks, owing to the charring of the cane sugar. 

 In the Adams' process use carbon tetrachloride instead 

 of ether. 



Humanized Condensed Milk. This is a condensed 

 milk with added milk sugar and cream, but no cane sugar. 

 When diluted with water in the proper proportion it is 

 practically identical in quantitative composition with 

 human milk. 



Infant Foods. These are sold as a substitute for 

 mother's milk. As they are in the dried state, their 

 composition should approximate to that of dried mother's 

 milk, which, according to Hutchison, is as follows : 



