THE ORGANIC CONSTITUENTS OF MILK 



37 



caseinogen and of lact-albumin have been made, especially into 

 that of the former body. In view, however, of the minimal 

 nutritional importance of these minor differences, a detailed account 

 will not be given. 



The main differences between the two bodies lie in the content 

 of sulphur and phosphorus. Caseinogen contains a considerable 

 amount of phosphorus, which is perhaps somewhat higher in cows' 

 than in human caseinogen. On the other hand, human caseinogen 

 appears to contain more sulphur than cows' caseinogen. Lact- 

 albumin of both species contains a higher proportion of sulphur 

 than the caseinogen of the corresponding species. 



The figures given by different observers, although showing 

 slight divergences in the amounts of the elements found, are yet 

 sufficiently concordant for it to be unnecessary to give many 

 quotations. The figures below may be taken as giving the values 

 sufficiently accurately : 



The results obtained by Langstein and Edelstein should also be 

 compared. 



The amount of calcium present in combination with caseinogen 

 is variously given, and a general figure is difficult to obtain from 

 the literature. Raudnitz appears to put the figure at something 

 over i per cent, of calcium oxide (CaO) in caseinogen, but his 

 remarks are not very precise. 



There is no doubt that a large part of the total calcium present 

 in milk is in combination with caseinogen. 



The differentiation of cows' milk and human milk assumes a 

 practical value in foreign hospitals where human milk is purchased 

 at a high rate for the feeding of sickly infants. There is evidently 

 a great temptation on the part of the nursing woman to add a 

 little cows' milk to her own and sell at the higher rate. 



Bauer (4) and Bacchi have independently shown that the milks 

 can be differentiated by a simple colour reaction. 



On the Interrelationship between the Proteins of the Milk 

 and their Relationship to those of the Blood. The researches 



