If this liquid is to be used merely for curdling milk, without separating the whey as a distinct layer, it should be added to the milk, previously warmed to a temperature of about 35o C. (95o F.), and the mixture should then be set aside undisturbed until it coagulates. If the whey is to be separated, the Liquid Rennet should be added to the milk while cold, and the mixture heated to about 350 C. (95o F.), but not exceeding 400 C. (104o F.). One part of the liquid should coagulate between 200 and 300 parts of cows' milk.

Liquor Sodii Arsenatis, Pearson. - This Solution contains about 1/10 per cent. of anhydrous Sodium Arsenate.

This preparation should not be confounded with the Liquor Sodii Arsenatis of the U. S. P., which is ten times stronger than the above. Pearson's Solution is official in the French Pharmacopoeia, under the title Solute d'Arse-niate de Soude (or Solution Arsenicale de Pearson).

Sodii Boratis Compositus (Dobell's Solution). - Sodium Borate and Sodium Bicarbonate, each 120 grains (8.0 Gm.);

Phenol, 24 grains (1.5 Gm.); Glycerin, 1/2 fluidounce (15 Cc); in Water, 16 fluidounces (450 Cc). Sodii Carbolatis (Phenol Sodique). - Phenol, 50 per cent.;

Sodium Hydroxide, 3 per cent.; in Water. Sodii Citratis. - Saturatio (Potio Riveri, Ph. Ger.). - Citric Acid, 150 grains (10.0 Gm.); Sodium Bicarbonate, 190 grains (12.5 Gm.); in Water, 16 fluidounces (450 Cc). Sodii Citro-tartratis (Effervescing Saline Water). - Sodium Bicarbonate, Tartaric Acid, Citric Acid, Syrup, and Water, in about the same proportions as in Solution of Magnesium Citrate, for which it is a cheaper substitute. Sodii Oleatis (Oleate of Sodium). - Intended to be used in the preparation of oleates. Strychninae Acetatis (Hall's Solution of Strychnine). - Each fluidrachm (4 Cc.) contains 1/8 grain (0.008 Gm.) Strychnine Acetate.

The Ph. Br. directs a Liquor Strychninae Hydrochloratis (with synonym, Liquor Strychniae) which is much stronger, and should not be confounded with the above preparation. It should never be dispensed unless expressly designated.

Zinci et Ferri Compositus (Deodorant Solution). - A combination of Sulphates of Zinc and Iron, Naphthol, Oil of Thyme, and Hypophosphorous Acid, in Water.

Used as a simple deodorant and antiseptic for common domestic use when it is unnecessary or impracticable to employ more powerful agents.

When a deodorant solution is required for purposes where iron is objectionable - as, for instance, when woven fabrics are to be steeped in it - the following preparation may be employed:

Liquor Zinci et Alutnini Compositus, in which the Iron Sulphate is replaced by Aluminum Sulphate.

Zingiberis (Essence of Ginger). - A 25 per cent. preparation of Ginger for flavoring aqueous mixtures.