314 



PHYSIOLOGICAL CHEMISTRY. 



milk secreted by both mammary glands amounts to 500-1500 grms. 

 in two hours. 



The quantitative composition of woman's milk is, even after 

 those differences are eliminated which depend on the imperfect 

 analytical methods employed, variable to such an extent that it is 

 impossible to give any average results. Eliminating certain of the 

 older, incorrect analyses, we here give only examples from the aver- 

 age results of a few modern investigators, taken from a very large 

 number of analyses (PFEIFFEE, LEEDS). The following figures are 

 parts per 1000. 



Although the composition of woman's milk is very variable, 

 and notwithstanding that in a few cases higher results (about 40 

 p. m.) have been obtained, by later analyses, for albuminous bodies, 

 still it seems that woman's milk. in general contains less proteids 

 and more sugar than cow's milk. The quantity of casein is not 

 only absolutely but also relatively smaller in proportion to the 

 quantity of albumin in woman's than in cow's milk. 



A further difference between woman's and cow's milk is that 

 the first is richer in lecithin but poorer in mineral bodies, especially 

 OaO and P 2 6 (it contains onty -J- and J, respectively, of the corre- 

 sponding quantity of these mineral bodies in cow's milk). 



In regard to the quantity of mineral bodies in woman's milk the 

 analyses of BUNGE are most reliable. He analyzed the milk of a 

 woman, fourteen days after delivery, whose diet contained very little 

 common salt for four days previous to the analysis (A), and again 

 three days later after a daily addition of 30 grms. NaCl to the 



