compabisojs^ of milks. 



391 



(6) Composition of Fat. — The following table (CVI.) gives 

 tte comparative figures for the composition of the fat of various 

 mammals : — 



Sugar. — The author has proved that the sugar of the milk of 

 goat, the ass, and the gamoose (in summer) contains milk-sugar. 



With Pappel the author obtained analytical figures which 

 showed that the sugar of the milk of the gamoose in winter 

 differed from milk-sugar, and with Carter that the sugar of 

 human milk did not correspond with milk-sugar. It is probable 

 also that the sugar of mare's milk is not identical with milk- 

 sugar. 



Deniges and also Landolf state that all milks contain lactose, 

 but that other sugars are present in addition. 



Proteins. — But little is known of the proteins of milk. It 

 appears probable that the curd-forming mUks contain the same 

 proteins as cow's mUk. The mUks which do not form curd may 

 differ in their proteins, but it is possible that the different reaction 

 with rennet is due to a deficiency of lime, or to an alkaline reaction. 



The following milks have an alkaline reaction to litmus : — 

 Human milk, the milk of the mare, ass, rabbit, sow, and cat. 



Composition of Milk. — Table CVII. gives the mean com- 

 position of the milk of different mammals. 



Of these milks those of the cow, goat, sheep, buffalo, mare, 

 ass, and, in some countries {e.g., Spain), sow are used for human 



