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Water is boiled for two purposes: first, cooking of itself to destroy organic impurities;

second, for cooking foods. Boiling water toughens and hardens albumen in eggs; toughens fibrin and dissolves tissues in meat; bursts starch-grains and softens cellulose in cereals and vegetables. Milk should never be allowed to boil. At boiling temperature (214° F.) the casein is slightly hardened, and the fat is rendered more difficult of digestion. Milk heated over boiling water, as in a double boiler, is called scalded milk, and reaches a temperature of 196° F. When foods are cooked over hot water the process is called steaming.

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