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Updated: May 25, 2025
Heulandite is distinguished from stilbite by its crystals and perfect solubility; from apopholite by form of crystals. In the next part of this paper I will commence with Staten Island. July 1, 1882.
We think again and then recognize in the puzzling substance the semitransparent fracture, the quality of becoming soft when exposed to heat and of burning with a smoky flame, the solubility in spirits of wine in short, all the distinguishing characteristics of resin. Here then are two more collectors of the exudations of the Coniferae.
Many other substances, which are so little soluble in water, that their solubility could not be otherwise detected of themselves, are made to appear soluble by means of siliceous matter; such is feld-spar, one of the component parts of rock-granite. Feld-spar is a compound of siliceous, argillaceous, and calcareous earth, intimately united together.
One of the most curious features was that the stone had not been large enough to make the complete statue, so that the surface was, in one place, still in the rough. The object had been found in wet ground. Its material was sulphate of lime, the slight solubility of which would have been sufficient to make it dissolve entirely away in the course of centuries.
By placing a test tube with a solution of five parts caustic potash in 100 parts water, a mixture of vegetable fibers and wool fibers, the latter dissolve if the fluid is brought to boiling above an alcohol flame, while the cotton and linen fibers remain intact. The solubility of the woolen fibers in potash lye is a ready means of ascertaining the percentage of wool fiber in the paper.
However, the greater solubility of iron compounds in hydrochloric acid makes it desirable to use this acid as a solvent, and experiments made with this end in view have shown that in cold, dilute hydrochloric acid solution, to which considerable quantities of manganous sulphate and an excess of phosphoric acid have been added, it is possible to obtain satisfactory results.
The erosions occasioned by this element depend not only on its quantity, but also on the length of time during which it remains, the velocity it acquires by its fall, and the degree of solubility of the rock.
Castor oil on the contrary dissolves completely, just like olive oil, and hence cannot be detected therein by this method. To detect this oil we must take the melting point of the acids along with the solubility of the oil itself in alcohol. Olive oil when mixed with 25 per cent. of cotton seed oil yields a granular precipitate, and so does 25 per cent. of sesame.
In large quantities, I concede, its lack of weight would betray it to a trained hand, but without testing its solubility in nitric acid, or the fact of its burning with a blue flame under the blow-pipe, it cannot be detected. In short, when crystallized in dodecahedrons " "Is it any good?" broke in the demonstrator. "Good?" said the professor. "Oh, you mean commercially? Not in the slightest.
For by what right is it that fusibility comes to be a part of the essence signified by the word gold, and solubility but a property of it? Or why is its colour part of the essence, and its malleableness but a property? Since, as has been said, several people observe several properties in the same substance; and I think I may say nobody all.
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