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That celebrated chemist was of opinion that the rivers do not take up these oxides from the soil over which they flow, but that they derive them from their subterranean sources, and deposit them on the rocks in the manner of cementation, by the action of particular affinities, perhaps by that of the potash of the feldspar.
Their rusty brown or yellowish colour is partly due to the oxides of iron, but chiefly to innumerable, microscopically minute, black specks, which, when a fragment is heated, are easily fused, and evidently are either hornblende or augite.
The southern range of tables is numbered from 14 to 23; and the northern range from 38 to 47. In the next case are the Oxides of Copper; bismuth; red oxide of zinc; cobalt ochres; oxide of uranium; and pitch ore. In the nineteenth case are the Oxides of Lead; and in the twentieth are the first of the oxides of electro-negative substances.
When you come to handle life and death as your daily business, your memory will of itself bid good-by to such inmates as the well-known foramina of the sphenoid bone and the familiar oxides of methyl-ethylamyl-phenyl-ammonium.
"It is perfectly true, so far as you have gone through the first invisible world of ether, you are much more masters of detail than we are. "We have not cared particularly for the minor details by which explosives are made, or metals obtained from oxides.
The cylinder with its contents was revolved for two hours, then the charge was withdrawn and drained nearly dry by suction, the resultant liquid being slowly filtered through broken charcoal on which the chloride crystals were deposited, in appearance much like the bromo-chlorides of silver ore seen on some of the black manganic oxides of the Barrier silver mines.
The European alabasters are accumulated masses of stalactite and stalagmite, formed by the slow dropping of water charged with sulphate of lime, to which circumstance they owe the parallel stripes or concentric circles with which they are marked, while the rich and delicate varieties of colouring are produced by the oxides of iron which the water carries with it in its infiltration through the intervening strata.
It is a small capsule or cup of a porous substance, used in the refining process, and possessing the property of absorbing the fused oxides and retaining the refined metal. What is the proportion of lead or of gold ore in M. Larinski's heart? Neither you nor I know." She was no longer listening; her chin in her hand, her glances wandered over the glade.
Now it has been observed, that if this decomposition of the peroxide of hydrogen takes place in contact with some metallic oxides, as those of silver, and the peroxides of lead and manganese, it superinduces a corresponding chemical action upon those substances; they also give forth the whole or a portion of their oxygen, and are reduced to the metal or to the protoxide; although they do not undergo this change spontaneously, and there is no chemical affinity at work to make them do so.
In the next case the series of Oxides begins. Herein are the oxides and hydrous oxides of manganese. Having examined the sulphurets and oxides, the visitor should cross to the northern suite of tables marked from 48 to 54. Here are arranged a series of the Carbonates, or combinations of carbonic acid with earths, metallic oxides or alkalis.
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