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Oils are divided into two classes, essential and fixed. Essential oils are volatile and soluble in alcohol. Examples: clove, rose, nutmeg, and violet. Fixed oils are non-volatile and soluble in ether, oil, or turpentine. Examples: oil of nuts, corn meal, and mustard.
Fats may be heated to a high temperature, as considered in cookery they have no boiling-point. When appearing to boil, it is evident water has been added, and the temperature lowered to that of boiling water, 212° F.
MILK
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COMPOSITION
Proteid, 3.4%
Fat, 4%
Mineral matter, .7%
Water, 87%
Lactose, 4.9%
Boston Chemist.
The value of milk as a food is obvious from the fact that it constitutes the natural food of all young mammalia during the period of their most rapid growth. There is some danger, however, of overestimating its value in the dietary of adults, as solid food is essential, and liquid taken should act as a stimulant and a solvent rather than as a nutrient. One obtains the greatest benefit from milk when taken alone at regular intervals between meals, or before retiring, and sipped, rather than drunk. Hot milk is often given to produce sleep.