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 mm. 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- 
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