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Show 420 APPENDIX F.- CHEMICAL ANALYSES. The water of the Hot Spring was found to have the specific gravity of 1.0130, and one hundred parts yielded solid contents 1.1454. Chloride of sodium 0.8062 Chloride of magnesium 0.0288 Chloride of oalcium. 0.1096 Sulphate of lime 0.0606 Carbonate of lime 0.0180 Silica « .. 0.0180 1.0602 NATIVE SALJERATUS AND ALUM. The speoimen labelled Efflorescence from a Salceratus Pond, on the Sweetwater River, has been tested^ nd found to be composed of the sesquicarbonate of soda, mixed with sulphate of soda and • chloride of sodium, and is one of the native salts called Trona, found in the Natron Lakes in Hungary, Africa, and other countries. Three grammes of this salt in dry powder, cleared of its earthy impurities, gave carbonic acid 0.9030 of a gramme, which would indicate 1.782S9 grammes of the sesquicarbonate. The other salts were found to be the muriate and sulphate of soda: the proportions were not determined. The specimen of alum from Alum Pointy Great Salt Lake, is a rare and interesting mineral It is a true alum; but instead of being an alum with an alkaline base, as potash or soda alum, it is found to be an alum with a base of manganese, differing from all other true alums in crystallizing in needle- shaped quadrilateral (?) prisms. It is soluble in several times its weight of water. It has the taste of ordinary alum, though less strong, from the fact, perhaps, that it is less soluble. The mineral is an effloresced mass, found on the surface of a slate rock abounding with a sulphuret ( as is believed) of manganese, from the decomposition of which the sulphur, being oxidized, is converted into sulphuric acid, and combining directly with the base, manganese and the alumina of the slate, forms the alum in question. The specimen, as it reached me, had lost nearly all of its water of crystallization; and, in order to make a fair analysis of it as a specific salt, a portion of the specimen was dissolved in water and recrystallized, and the crystals dried to the first appearance of efflorescence on the projecting points, and then a given weight of i |