Made by mixing bicarbonate of sodium, and tartrate of potassium and sodium (rochelle salt), in powder together, for one paper. For another paper, tartaric acid is put up, in proportionate quantity. When administered, each powder is dissolved in water, and the two solutions are poured together. It is a mild but prompt effervescing purgative, much in use before the invention of the effervescing solution of citrate of magnesium. Each saline powder contains forty grains of bicarbonate of sodium (soda) and two drachms of Rochelle salt. Bach acid powder consists of thirty-five grains of tartaric acid.