Of Simple Earths, 7 Barytic, or Ponderous Earth. This earth, when free from all combination (a ftate in which nature never prefents lt), forms alfo a lime with many ot the pronerties of common lime, butdiffers front it by man) r others. It is foluble in water; but, in the temperature of 6o°, it requires, according to Bergman, noo times its weight of that folvent to hold it in folution, This lime is foluble in the nitrous and marine acids, though much more difficulrly than com mon lime; but with thefe acids it er)llallizes, and the cryftals are not deliquefcent as tnofe afforded by common lime are. Thefe folutions are precipitated by the vitriolic acid as thofe of common lime; but the feleime, of which common lime is the bafis, is foluble in about 450 or 500 times its weight of water; whereas that which has -barytic lime for its bafis is mfoluble in lefs than 40000 times its weipbt of water. 0 II barytic lime-water be added to a folution of tartar vitriolate, or Glauber’s falt, it i'eizes the acid of thelc falts, and forms a precipitare; it alfo precipitates the folutions of nitrated and muriated ftronthian. The ufual fluxes affedt it as they do calcareous earth. Magneßa, or Muriatic Earth. y ari ous clays, _ flones, and falts, particularl Epfom falt, contain this earth ; but uncombine« B 4