Page:The Boston cooking-school cook book (1910).djvu/39

 CHAPTER II

COOKERY

Cookery is the art of preparing food for the nourishment of the body.

Prehistoric man may have lived on uncooked foods, but there are no savage races to-day who do not practise cookery in some way, however crude. Progress in civilization has been accompanied by progress in cookery.

Much time has been given in the last few years to the study of foods, their necessary proportions, and manner of cooking them. Educators have been shown by scientists that this knowledge should be disseminated; as a result, "Cookery" is found in the curriculum of public schools of many of our towns and cities.

Food is cooked to develop new flavors, to make it more palatable and digestible, and to destroy micro-organisms. For cooking there are three essentials (besides the material to be cooked),—heat, air, and moisture.

Heat is molecular motion, and is produced by combustion. Heat used for cookery is obtained by the combustion of inflammable substances—wood, coal, charcoal, coke, gas, gasoline, kerosene, and alcohol—called fuels. Heat for cookery is applied by radiation, conduction, and convection.

Air is composed of oxygen, nitrogen, and argon, and surrounds everything. Combustion cannot take place without it, the oxygen of the air being the only supporter of combustion.

Moisture, in the form of water, either found in the food or added to it.

The combined effect of heat and moisture swells and bursts starch-grains; hardens albumen in eggs, fish, and meat; softens fibrous portions of meat, and cellulose of vegetables.