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A white substance is now left undissolved; it is a compound of muriatic acid and lead, which, when heated, changes its colour, and forms Turner's yellow; a very beautiful colour, much in use among coach-painters. Wash the surface of the wood with weak alum-water, after being well sand-papered; then go over it with linseed oil, coloured with murat amber and red lead.
Iron ores and refinery cinders may indeed, if they are reduced to a very fine state of division, be commonly decomposed by boiling with hydrochloric acid with or without the addition of sulphuric acid, but the undissolved silica is generally rendered impure by manganese, which can only be removed by fusion with soda.
Experiments are being made with more or less promise of success in the direction of the chemical treatment of this liquid so as to purify its effluent water, and retain in a solid form, and in combination with certain valuable added ingredients, all of its undissolved impurities. None of these processes can as yet claim consideration in regulating public works.
Streams must once, though historically unknown, have flowed in them; and M. d'Orbigny argues from the presence of undissolved salt over the whole surrounding country, that the streams must have arisen from rain or snow having fallen, not in the adjoining country, but on the now arid Cordillera.
Singular is this whole part of Schleiermacher's construction, with its lapse into abstraction of the familiar sort, of which, in general, the working of his mind had been so free. For surely what we here have is abstraction. It is an undissolved fragment of metaphysical theology. It is impossible of combination with the historical.
If the above remarks be just, we are led to the very unexpected conclusion, that a dry climate, by leaving the salt from the sea-spray undissolved, is much less favourable to the preservation of upraised shells than a humid climate. However this may be, it is interesting to know the manner in which masses of shells, gradually upraised above the sea-level, decay and finally disappear.
The quantity of matter removed by the hot water is so small, that close upon 90 per cent, of the nourishing and feeding constituents are left behind in the undissolved sediment, the substances extracted being principally salts and colouring matters.
Tin, lead, and portion of the iron, if present, are removed by this method. The silica, carbon, and portions of copper are left behind with the undissolved fragments of metals. The precipitated salt, after slight washing, is dissolved in water and strong solution ammonia added. A clean iron plate is immersed in the solution to remove any trace of copper.
When one sample has dissolved all the albumen, it is manifestly superior to the other which has failed to do so in the given time. If many samples have to be compared, it will be necessary to start with known quantities of albumen, and weigh the undissolved residues in the manner above indicated.
To admit that there is an outside power, something uncorrelated, is to invite fear, apprehension, uncertainty and terror. This undissolved residuum is the nest-egg of superstition. The man who believes that God is the Whole, and that every man is a necessary part of the Whole, has no need to placate or please an intangible Something.
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