SOLID CAUSTICS, STRONG.
No. 1.The red-hot iron. (See Firing.)
2.Pure potash with lime.
3.Nitrate of silver, or lunar caustic.
4.Nitrate of copper.
MILD CAUSTICS, SOLID.
No. 1.Acetate of copper, or distilled verdigris.
2.Sulphate of copper, or blue vitriol.
3.Red nitrated quicksilver, red precipitate, or nitric oxide of mercury.
4.Burnt alum.
5.Common verdigris.

The mild require to be finely powdered and sprinkled on the ulcer; and are sometimes mixed with digestive ointments to increase their power.

STRONG CAUSTICS, LIQUID.
No. 1.The sulphuric and nitrous acids, which must be used cautiously: they may be diluted with a sufficiency of water, to be applicable to the purpose required.
2.Nitrous acid1 oz.
Quicksilver½ oz.

Place them in a large gallipot, or open phial, and avoid the noxious fumes which arise. When the quicksilver is perfectly dissolved, and the mixture cold, it may be put into a phial and corked.

This is a strong and efficacious caustic; a certain remedy for the foot-rot in sheep, and effectual in canker of the horse’s foot, provided these complaints are properly managed in other respects. It is formed with melted hog’s lard into a strong detergent ointment, or diluted with water.

No. 3.Nitrous acid1 oz.
Verdigris½ oz.—Mix.

This caustic is similar to the former, and applicable to the same purposes.

No. 4.Muriate of antimony, or butter of antimony.
5.Muriate of quicksilver, or sublimate1 dr.
Muriatic acid2 dr.

This is a very powerful caustic, and always requires dilution. Yellow arsenic mixed with lime and grease, or hog’s lard, is sometimes used as a caustic to destroy warts, or cure fistula or poll-evil.

MILD CAUSTICS, LIQUID.
No. 1.Solution of blue vitriol.
2.Any of the stronger caustics, except butter of antimony, diluted with an equal quantity, or more, of water.
3.Muriatic acid.
4.Muriate of iron.—White.