B. When applied to the skin, at first warmth, then sharp burning, lasting for three or four hours, and gradually disappearing. The skin is then found to be somewhat softened at the centre, and coriaceous at the circumference. The whole depth of the skin is involved. The eschar, at first soft and humid, soon dries, and separates in from one to four weeks. The slough may be four or five times the diameter of the piece of potash, 3, 1: 305. The scar is always larger than the place to which the potash was applied, 22, 2: 337.

C. Chronic eczema, 66, 80. Furuncles, 98, 38.

D. (Diluted.) In dry, scaly eruptions, pityriasis, psoriasis, and ichthyosis, 24, 1: 272. Lupus, 79, 66: 206. Lupus erythematosus, 92, 2: 317. Rodent ulcer, MacConnell, 145, Sept. 21, '78. Naevus pigmentosus, 206. Trichophytosis capitis, Purdon, 135, 4: 295. Acne indurata, callosities, 203.

Remarks

The officinal preparations of Potassa and Potassium are: Liquor Potassoe; Potassa cum Calce; Potassii Acetas; Potassii Car-bonas; Potassii Bicarbonas; Potassii Bichromas; Potassii Bromidum; Pottassii lodidum; Potassii Tartras; Potassii Bitartras; Potassii et Sodii Tartras; Potassii Chloras; Potassii Citras; Potassii Ferro-cyanidum; Potassii Nitras; Potassii Sulphas; Potassii Sidphuretum; Liquor Potassii Citratis; Mistura Potassii Citratis; Trochisci Potassii Chloratis.

Potassii Acetas, U.S

A. Diaphoretic, 7, 131.

C. Eczema, psoriasis, Easton, 150, May, '50, 423; 201; 204; 207. Rosacea, 20L