These are derived from the flesh of animals, and consist of meats and the internal organs of animals and fowls used as food - sweetbreads, tripe, liver, kidneys, brains, tongues and "frys," and the roe, milts and sounds of fish, gelatin and isinglass; poultry and game; sea foods - fish, shell fish, as oysters, clams, scallops; the Crustacea - lobsters,, crabs, prawns, shrimps and cray fish; and reptiles, as green turtles and terrapin; and eggs and milk.

In feeding the sick, the most important of these, perhaps, are eggs and milk.