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Composition

Ash, 3% Protein, 1% U. S. Dept. Agriculture.

Butter of commerce is made from cream of cow's milk. The quality depends upon the breed of cow, manner of, and care in, feeding. Milk from Jersey and Guernsey cows yields the largest amount of butter.

Butter should be kept in a cool place and well covered, otherwise it is liable to become rancid; this is due to the albuminous constituents of the milk, acting as a ferment, setting free the fatty acids. First-quality butter should be used; this does not include pat butter or fancy grades. Poor butter has not been as thoroughly worked during manufacture, consequently more casein remains; therefore it is more apt to become rancid. Fresh butter spoils quickly; salt acts as a preservative. Butter which has become rancid by too long keeping may be greatly improved by melting,