Lunar Caustic, Caustic Potash, and Chloride of Zinc. See Argenti nitras, PotassAe hydras, and Zinci chloridum, Pocket Formulary.

Canquoin's Caustic is made by mixing chloride of zinc with twice its weight of flour and a little water into a stiff paste, which is to be rolled out to the required thickness, and cut to the size of the part to be destroyed, the skin being previously removed by a blister. Another caustic is made with 2 parts of chloride of zinc, 1 of butter of antimony, and 5 of flour.

Sulphuric Caustic is made by triturating hay saffron with oil of vitriol, so as to form a ductile mass. Bouchardat recommends solidifying the acid by ivory or lamp black.

Solidified Nitric Acid is merely lint soaked with strong nitric acid, squeezed, and formed to the required shape.

Filho's Caustic is made by melting together in an iron ladle 2 parts of caustic potash and 1 of lime over a quick fire, and pouring it into leaden tubes of the desired size. The air must be excluded when not in use, by beeswax, or other means.

Fomentations

These should be applied moderately warm (about 120° F.) by means of flannel dipped in the liquid, and frequently renewed from time to time, keeping the parts covered. Emollient. 1. Coarse bran 2 double handfuls, water 6 quarts, boil and strain,