Powders, Efferves′cing. Prep. 1. (Pulveres effervescentes—Ph. E.) Take of tartaric acid, 1 oz.; bicarbonate of soda, 1 oz. 54 gr. (534 gr.), or bicarbonate of potassa, 1 oz. 2 dr. 40 gr. (640 gr.); reduce the acid and either bicarbonate separately to fine powder, divide each of these into 16 powders, and preserve the acid and alkaline powders in separate papers of different colours.
2. (Pulveres effervescentes citrati—Ph. D.) Take of citric acid (crystallised), 9 dr.; bicarbonate of soda, 11 dr., or bicarbonate of potassa, 13 dr., proceed as last, dividing each into 18 parts.
3. (Pulveres effervescentes tartarizati—Ph. D.) Take of tartaric acid (in crystals), 10 dr.; bicarbonate of soda, 11 dr., or bicarbonate of potassa, 13 dr.; reduce them to powder, and divide them into 18 parts, as before. (See below.)
Powders, Effervescing, with Iron. (P. Cod.) Syn. Pulveres effervescentes cum ferro. Prep. Tartaric acid, 23⁄4 oz.; bicarbonate of soda, 2 oz.; powdered sugar, 9 oz.; dried sulphate of iron, 46 gr. Mix the acid and the sulphate of iron (previously reduced to coarse powder), add the sugar, and lastly the soda, not in very fine powder. All the ingredients must be very dry. Half an ounce of this powder is to be quickly added to 2 pints of pure water (without air) contained in a bottle, which is to be immediately corked.
Powders for Gazogene. For 2 pints:—Powdered tartaric acid, 14 scruples; bicarbonate of soda, 17 scruples.
For 3 pints:—Powdered tartaric acid, 17 scruples; bicarbonate of soda, 21 scruples.
For 5 pints:—One each charge of 2 and 3 pints.
Powders, Gin′ger Beer. Syn. Pulveres effervescentes cum zingibere, L. Prep. 1. Powdered white sugar, 1 to 2 dr.; bicarbonate of soda, 26 gr.; finest powdered Jamaica ginger, 6 gr.; essence of lemon, 1 drop; mix, and wrap it in blue paper. In the white paper put of powdered tartaric acid, 35 gr., or of powdered citric acid, 30 gr.
2. Finest Jamaica ginger, 1 dr.; bicarbonate of soda, 5 dr.; white sugar, 16 dr.; essence of lemon, 6 or 8 drops; mix, and divide it between 12 papers (blue). For the white papers, divide tartaric acid, 6 dr., in the same way. By taking the drachms as ounces, the quantity will be sufficient for 8 dozen. For use dissolve one of each colour separately in somewhat less than half a glass of water, mix the two, and drink the mixture whilst effervescing.
3. (In one bottle.)—a. The sugar and the