(From the same). Curdled concretions, formed by the mixture of two liquors, are thus 3 M 2 called; such, tor instance, as the curd for cheese, separated from the serous part of milk, by means of rennet infused in warm water. Rennet, or runnet, is the stomach of a young sucking animal, and curdles milk without any previous preparation. The common method is, to take the calf's stomach, clean it well, salt and hang it up in brown paper: when this is used, the salt is washed off, a piece is macerated in a little water during the night, and in the morning the infusion is poured into the milk to curdle it. This property of the stomach has been attributed to the remains of the food, or to its acid; but the stomach retains its power when nicely cleaned, and no acid can be discovered in it by the most delicate taste. The whole stomach produces this singular change, and it is undoubtedly a chemical one. Some other substances, not acid, arc said to produce the same effect; and Spallanzani mentions his having found similar changes from infusions of the liver of the gallinaceous tribe, particularly turkeys.
Coagulum aluminis, called also cataplasma alu-minis. In ophthalmia it is found very serviceable, particularly in that species called purulent, applied between two pieces of fine soft linen rag. It is also said to be very effectual as a remedy for chilblains. See also Alumen.