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Show J 420 APPENDIX F.- CHEMICAL ANALYSES, tfhe water of the Hot Spring was found to have the specific gravity of 1.0180, and one hundred parts yielded Bolid contents 11454/ - Chloride of sodium %......;....... i.. « 0.6b § 2 Chloride of magnefehuat .....-._....' 0.0288 Chloride of calcium*../., .' 0.1096 8ulphate of lime % !....'. 0.0806 Carbonate of lime .....~.. f 0.0180 Silica „...... A ;...:.*...... i ... o. oiso 1.0602 NATIVE SALJSRATSJS AND ALUM. The specimen labelled Efflorenoence from a SaUeratu* Pond, on the Sweetwater River, baa been tested, and found, to be composed of the sesquicarbonate. of soda,, mixed with sulphate of soda and chloride of sodium, * nd is tone of the native salts called lYoua, 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 indicates 1.78239 grammes of the sesquic& rbonate. The other salts were found'to be the muriate and sulphate of soda: the proportions were not determined. The specimen bf alum from Alum Pdint7 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 Boda alum, it k 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 solutye in several times its weight, of water. It has the taste of ordinary alum, though less strong, from the fact, per-haps, 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 oxidised, 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 |