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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

Air

Moisture

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.

Among fuels, kerosene oil is the cheapest; gas gives the greatest amount of heat in the shortest time. Soft wood, like pine, on account of its coarse fibre, burns quickly; therefore makes the best kindling. Hard wood, like oak and ash, having the fibres closely packed, burns slowly, and is used in addition to pine wood for kindling coal. Where only wood is used as a fuel, it is principally hard wood.

Charcoal for fuel is produced by the smothered combustion of wood. It gives an intense, even heat, therefore makes a good broiling fire. Its use for kindling is not infrequent.

There are two kinds of coal: Anthracite, or hard coal. Examples: Hard and free-burning White Ash, Shamokin, and Franklin. Nut is any kind of hard coal obtained from screenings. Bituminous, or soft coal. Example: cannel coal.