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and roosters are used for food purposes, but especially the young roosters are devoted to food purposes while the young hens are often kept for the production of eggs.

Preparation of Chickens for Food Purposes.—In former times, when the chickens of commerce were derived chiefly from the farm, no special preparation was made before the chicken was marketed. The eggs were hatched in the old-fashioned way by the hens and the chicks sold to hucksters or in market, at various ages and without any special preparation or control. All this has been changed in later times by the introduction of scientific methods of breeding poultry. It has been demonstrated that the breeding and care of poultry require as much scientific and economic attention as is devoted to any other successful business.

Fig. 12.—Chicken House, Rhode Island Experiment Station.

The Incubator.—The introduction of the incubator for the hatching of eggs with the other necessary arrangements for the caring for young chicks has perhaps done more than any other one thing to revolutionize the method of preparing poultry for the market. By the use of the incubator the hatching of chicks is regulated with the utmost degree of nicety. A larger percentage of eggs produce chicks and the expense of the incubating process is greatly diminished. The incubator is in its widest significance a thermostat in which the eggs may be placed and maintained constantly at the temperature of the hen's body, namely, about 102 degrees F. The arrangement of the chicken house and the other environments of the young chick are shown in Fig. 12.