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Powders, Soda-Water

Place thirty grains of bicarbonate of soda in each blue paper, and twenty-five grains of tartaric acid or twenty-four grains of citric acid in each white paper. To use, empty the contents of each paper separately into about half a glassful of water; mix the two and drink at once. This is a cooling, wholesome summer drink, but it should not be partaken of to excess.