Stock in its composition is not confined to any set rules for any particular proportions. All cook books give particular as well as general directions for its manufacture; but all cooks know that the most economical plan is to have a general stock-pot, where, or into which, you can throw any pieces of beef or any piece of meat from which gravy can be extracted—bones, skin, brisket or tops of ribs, ox-cheek, ham, trimmings of turkey and other fowls, pieces of mutton, bacon, veal, game, etc., etc. In fact, anything that will become a jelly will assist in making stock. To this medley of ingredients add pepper, salt, spices, herbs, carrots cut small, onions, and curry, if wished, etc., and stew all to a rich consistency over a slow fire, and then remove to cool. When cool, or rather cold, every particle of fat must be removed and stock poured clear of all sediment; it is now ready for use. When very rich soup is desired, the jelly from a cow-heel, or lump of butter rolled in flour, must be added to the stock.