Of 1,000 parts of milk there are various constituent substances as follows.

Constituents.

Number.

Water..............

840

Milk-Sugar...........

45

Butter...............

40

Caseine.............

40

Phosphate of Line......

17

Chloride Potassium....

9

Phosphate Magnesia...

4

Free Soda...........

3

Common Salt........

3