72 



THE POPULAR SCIENCE MONTHLY 



consequently is more suitable for the food of infants. The fat in human 

 milk is more finely distributed than in cow's milk, which also enhances 

 digestion. Jersey cows furnish milk with a fat content nearly the same 

 as human milk, but the fat globules are larger, and therefore Jersey 

 milk is not as suitable for infants as milk from Shorthorns or Holsteins. 

 The latter breeds produce milk with less fat than Jersey cows, but the 

 globules are smaller. 



It is obvious that human milk is the only perfect food for infants. 

 If it is necessary to find a substitute we must be careful to select milk 

 from cows whose product comes as near to human milk as possible. 

 Here again it must be emphasized that mixed milk from a herd consist- 

 ing of cows of different breeds, and in different stages of lactation, is 

 the best milk to use. It is true that infants can adapt themselves to 

 the use of a different milk from the one designed for them by nature, 

 and it is fortunate that this is so. Cow's milk is the only available 

 substitute for human milk. In some countries goat's milk is used, but 

 this offers no advantages, and some disadvantages. Mare's milk or 

 ass's milk is nearer in composition to human milk than other milks, 

 but is difficult to obtain. Cow's milk serves the purpose very well, if 

 it is derived from a mixed herd and obtained under cleanly conditions. 



The essential points in producing healthful milk are to observe 

 cleanliness in the process and to cool the milk rapidly and keep it cold. 

 The result of a tendency to comply with these demands has been the 

 establishment of dairies where milk is produced on scientific principles. 

 The cows must be fed with wholesome fodder, must be kept clean and 

 be in perfect health. Tuberculosis is detected by the most rigid test 

 known, the application of tuberculin. This method shows the presence 



Photogeaph 7 



