MILK AND MILK PEODUCTS 



333 



formed the subject of several humorous skits, 1 he still adheres to the 

 opinion. 



At periods of sexual excitement, cows often show considerable 

 irregularity in their milk, both in quantity and quality, and there can 

 be little doubt that such circumstances as palatable or distasteful food, 

 comfortable or comfortless housing, freedom or otherwise from annoy- 

 ance by insects or dogs, and other conditions affecting the placidity 

 of existence, may exert considerable influence upon the physiological 

 processes going on in the animal and thus affect the secretion of milk. 



THE MILK OF OTHER ANIMALS. The following table gives 

 the average composition of the milk of various mammals, mainly from 

 analyses compiled by Kichmond' 2 : 



The constituents shown in the above table not only vary in amount, 

 but also in nature ; the fat, particularly, differs in different animals. 

 The fat of human milk, for example, is much poorer in volatile acids 

 but richer in unsaturated acids than the fat of cows' milk. Laves 8 

 found in the fat of human milk only 1'4 per cent of volatile acids, in- 

 cluding only a mere trace of butyric acid. The fat globules are 

 smaller than in cows' milk. 



Casein from different milks is also found to differ, especially in the. 

 manner of its coagulation under the influence of rennet or of acids. 



The sugar of the milk of certain animals, too, apparently differs 



1 For example, see Moonshine, February 8, 1902 ; Punch, May 13, 1903. 



2 Dairy Chemistry, p. 323. 



3 See Voelcker, Jour. Chem. Soc., 1882, Abstracts, 541 ; also Sartori, Jour. Chem. 

 Soc., 1891. Abstracts, 951. 



4 See Sshlossrnann, Jour. Chem. Soc., 1897, Abstracts, ii. 574, who found much 

 less fat. 



6 See Doremus, Jour. Chem. Soc., 1891, Abstracts, 98. 



6 See also Pizzi, Jour. Chem. Soc., 1896, Abstracts, ii. 120. 



7 Werenskiold, Expt. Stn. Record, 1896, 713. 



8 Jour. Chem. Soc., 1894, Abstracts, ii. 392. 



