MILK 



ANALYTIC DATA 



Milk, the nutritive secretion of nursing mam- 

 mals, contains water, fat, proteins, sugar, and 

 mineral matter. Cow's milk is meant in all 

 cases, unless otherwise stated. Milk as taken 

 from the animal is generally termed "whole 

 milk." 



Fat. — This occurs in globules varying from 

 0.0015 "^J^- to 0.005 mm. in diameter, in a 

 condition which prevents spontaneous coales- 

 cence. It is peculiar among animal fats in 

 containing a notable proportion of acid radicles 

 with a small number of carbon atoms. 



Proteins. — The nature of the proteins of 

 milk has been much discussed, but it is now 

 generally conceded that there are at least three 

 forms, casein, albumin, and globulin, the casein 

 being present in by far the greatest amount, 

 and the globulin as traces only. 



Casein. — Casein is probably in part in 

 combination with phosphates. It is precipi- 



