{Seidlitz powders}, effervescing salts, consisting of two
separate powders, one of which contains forty grains of
sodium bicarbonate mixed with two drachms of Rochell? salt
(tartrate of potassium and sodium) and the other contains
thirty-five grains of tartaric acid. The powders are mixed
in water, and drunk while effervescing, as a mild
cathartic; -- so called from the resemblance to the
natural water of Seidlitz. Called also {Rochelle powders}.
{Seidlitz water}, a natural water from Seidlitz, containing
magnesium, sodium, calcium, and potassium sulphates, with
calcium carbonate and a little magnesium chloride. It is
used as an aperient.