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Updated: June 18, 2025
By the oxidation of other elements, sulphates of oxide of iron and alkalies result, which, by double decomposition, with carbonate of lime, give rise to the formation of gypsums which appears in the form of rosettes, festoons and various other imitative forms on the walls and ceilings of the caves.
In crossing this central area for the second time, with a mind less distracted by the novelty of the surroundings, I observed considerable deposits of remarkably impure sulphur, as well as sulphates of lime and alum in the larger fissures. The presence of moisture was always apparent in connexion with these formations.
Add 1-2 cc. of freshly prepared starch solution and titrate to the disappearance of the blue color. As a strong acid it will also dissolve the copper from carbonate ores. The hydrochloric acid is added to dissolve oxides of iron and to precipitate silver and lead. The sulphuric acid displaces the other acids, leaving a solution containing sulphates only.
The evaporation is extremely strong, and favoured by the constant motion of the air; so that the salt is collected in eighteen or twenty days after the pits are filled. Though the muriate of soda is manufactured with less care in the peninsula of Araya than at the salt-works of Europe, it is nevertheless purer, and contains less of earthy muriates and sulphates.
First, at least three earthy salts-the sulphates of lime, alumina, and potassa. All these exist uncombined in the gum, and free to work their will on the mucous tissues. A green extractive matter, which comes in all vegetal bodies developed under sunlight, next deserves a place by itself, because it is one of the few organic bodies of which no rational analysis has ever been pretended.
Blaisdell as he listened to his explanation of the different classes of ore, and the various kinds of treatment which they required, and met some of his old college acquaintances, the sulphates, nitrates, carbonates, and other members of that numerous family, in new and startling array; for Mr.
The first northern case is covered with various Sulphates, or metals in combination with sulphuric acid, exhibiting beautiful crystals and colours, including sulphate of magnesia from Oregon; sulphate of zinc, or white vitriol; sulphate of iron, or green vitriol; and the splendid blue sulphates of copper from Hungary; beautiful sulphates of lead from Anglesea; sulphates of alumina; common alum; and the splendid specimens of lazurite, or lapis-lazuli,
If it contain any saline substances, for example, the sulphates of soda or magnesia, their quantities must be very insignificant. In Italy, the Pisciarelli of the lake Agnano have a temperature equal to 93 degrees. It cannot proceed from the decomposition of sulphurets of iron, or pyritic strata.
But in another direction still does the farmer depend directly upon bacteria The most important factor in the fertility of the soil is the part of it called humus. This humus is very complex, and never alike in different soils It contains nitrogen compounds in abundance, together with sulphates, phosphates, sugar, and many other substances.
Innumerable springs issue out of this green, sloping meadow among the mountains, some of them icy cold, but over twenty of them hot, and seasoned with a great many disagreeable sulphates, carbonates, and oxides, and varying in temperature from ninety-five to one hundred and twenty-three degrees Fahrenheit.
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