2770. Antalkalies are given to neutralize an alkaline state of the system. They are citric acid, lemon-juice, and tartaric acid.

2771. Citric acid is used to check profuse sweating, and as a substitute for lemon juice when it cannot be procured.

Dose from ten to thirty grains.

2772. Tartaric acid, when largely diluted, forms an excellent refrigerant beverage and antalkali. It enters into the composition of extemporaneous soda-water.

Dose, from ten to thirty grains.

2773. Escharotics are remedies used to destroy the vitality, of a part. They comprise lunar caustic, bluestone, and solution of chloride of zinc.

2774. Bluestone, or sulphate of copper, is used in a solution of from four to fifteen grains to the ounce of water, nd applied to foul and indolent ulcers, y means of rag dipped in it, and is ubbed, in substance on fungous rowths, warts, etc, to destroy them. Caution. It is a poison.

2775. Lunar Caustic, or nitrate of silver, is an excellent remedy in erysipelas when applied in solution "one drachm of the salt to one ounce of water), which should be brushed all over the inflamed part, and for an inch beyond it. This blackens the skin, but it soon peels off.

To destroy warts, proud flesh, and unhealthy edges of ulcers, etc, it is in-valuable; and as an application to bed-sores, pencilled over with a solution of the same strength, and in the same manner as for erysipelas.

Caution. It is a poison.

2776. Solution of chloride of' zinc, or more commonly known as "Sir William Burnett's Disinfecting Fluid," is a valuable escharotic in destroying the parts of poisoned wounds, such as the bite of a mad dog.

It is also very useful in restoring the hair after the scalp has been attacked with ringworm; but its use requires extreme caution, as it is a powerful escharotic. In itch, diluted (one part to thirty-two) with water, it appears to answer very well.

Caution. It is a most powerful poison.