478 Report oF THE CHEMIST OF THE 
contained in the milk. The two milks poor in fat, though con- 
taining nearly the same amount of fat, differed in their casein 
content more than did the richest milk and that of No. 1 herd 
giving milk poor in fat. 
e. In order to compare the milk of different herds of cows, it 
is important that the comparison be continued through an entire 
season or period of lactation to get entirely reliable results. 
12. GeneraL Summary or Resvuuitrs Revatingc To THE Com- 
POSITION OF NormMaAL MILK. 
1. Pounds of Solids in 100 Pounds of Milk. 
- During the season, the solids in 100 pounds of normal milk 
varied from 12.29 to 13.89 pounds, and averaged 12.62 pounds. 
2. Pounds of Solids not-Fat-in 100 Pounds of Milk. 
The amount of solids not fat in 100 pounds of milk varied | 
from 8.61 to 9.29 pounds,and averaged 8.90 pounds during the 
season. 
3. Pounds of Cheese-Producing Solids in 100 Pounds of Milk. 
The amount of cheese-producing solids (fat and casein) in 100 
pounds of milk varied from 5.59 to 6.74 pounds, and averaged 
6.14 pounds during the season. 
4, Pounds of Whey-Solids in 100 Pounds of Mitk. 
The amount.of whey-solids (albumen, sugar, etc.) in 100. pounds 
of milk varied from 6.33 to 6.73 pounds, and averaged 6.49 
pounds during the season. 
5. Pounds of Kat in 100 Pounds of Mitk. 
The amount of fat in 100 pounds of milk varied from 3.40 to” 
4.10 pounds, and averaged 3.73 pounds during the season. 
6. Pounds of Nitrogen Compounds in 100 Pounds of Milk. - 
The amount of nitrogen compounds in 100 pounds of milk 
varied from 2.94 to 3.46 pounds, and averaged 3.13 pounds during 
the season. 

