12 



MILK AND ITS HYGIENIC RELATIONS 



Schlossmann obtained figures for the milk of a large number 

 of women by taking a sample of the milk expressed from the 

 opposite gland from that at which the child was feeding. The 

 average results obtained were as follows : 



The figures in these tables show that there is a general tend- 

 ency for the amount of nitrogen to fall during lactation. The 

 figures for fat and sugar, although showing some variations, do 

 not exhibit any decided alteration in relation to the period after 

 parturition. 



Bamberg, in the course of other investigations, found the 

 same tendency for the nitrogen content to fall during lactation. 



Towards the end of lactation certain properties of the early 

 period tend to reappear, but as these do not appreciably affect 

 the chemical composition of the milk, they will not be considered 

 in this chapter (see Chap. VI.). 



Cows' Milk. Eckles and Roscoe Shaw obtained elaborate 

 data as to the effect of the stage of lactation upon the milk 

 of cows. The estimations were commenced approximately one 

 month after parturition except in one case Jersey cow (c) 

 where the first sample was taken later. The figures given are too 

 numerous to quote, and it has been necessary for the present pur- 

 pose to take only the first and last four-weekly averages of the 

 estimations obtained for the more important constituents. These 

 are given on p. 13. 



The intermediate figures, which are not given here, show a slight 

 drop in the nitrogen figures in the early months of lactation, followed 

 by a corresponding rise towards the cessation of the function. 

 Eckles and Shaw also compared the total amount of milk given 



1 This second figure is obtained if the results given by the milk of three 

 women in whom lactation had nearly ceased, are omitted. 



