PASTEURIZATION 223 



that boiling the milk made practically no difference. It 

 was formerly thought that when boiled milk of a foreign 

 species was fed to infants, owing to the difference in the 

 composition of the milk the boiling would have a more 

 appreciable effect. This, however, Thiemich found not to 

 be the case, which is also the experience of Finkelstein. 

 Dr. Lane-Claypon studied the records of Ballin in Berlin 

 among the children of the working class, one series being 

 breast-fed and the other fed on the milk from municipal 

 dairies, which contained 3 per cent of fat and from 20,000 

 to 30,000 bacteria per cc., produced and handled by care- 

 ful methods. It was found that the breast-fed children 

 did not have so great a physiologic drop in weight im- 

 mediately after birth as did those artificially fed on boiled 

 cow's milk. These infants fed on boiled cow's milk lost 

 considerably more weight in the early days, but by the 

 end of the two hundred and thirtieth day the difference 

 was no longer present, and no difference was noted by the 

 end of the first year, except possibly a slight variation in 

 favor of the boiled milk. At the end of twelve months 

 there was no greater percentage of rickets in the babies 

 fed on boiled milk than in the breast-fed infants. 



The results of animal experiments are somewhat con- 

 tradictory and rather unsatisfactory. Observation upon 

 infants, however, gives us definite results. Finkelstein, for 

 instance, has shown that infants evidently do worse with 

 cooked woman's milk than with raw milk. These experi- 

 ments correspond entirely with similar experiments made 

 with cow's milk upon calves. Finkelstein next made the 

 experiment of feeding cooked and uncooked cow's milk 

 to children. He used the best milk obtainable in Berlin, 

 and was careful to use the same milk in both cases. The 

 additions, dilutions, and other conditions were precisely 

 the same. The only factor which varied was that in one 

 instance the milk was cooked and the other raw. A study 

 of these parallel cases does not show any essential differ- 



