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Updated: May 16, 2025
The stones, with which the ground was so thickly covered as to exclude vegetation, were of different lengths, from one inch to six, they had been rounded by attrition, were coated with oxide of iron, and evenly distributed. In going over this dreary waste the horses left no track, and that of the cart was only visible here and there.
For this purpose, in a second bag, he placed seven quarts of nitrous oxide, and made from it three inspirations, and three expirations, and then instantly transferred his mouth to the nitrous gas bag, and turning the stop-cock, took one inspiration.
Muscovite is often called common or potash mica; Lepidolite is characterised by containing lithia in addition; Biotite contains a large amount of magnesia and oxide of iron; whilst Phlogopite contains still more of the former substance. In rocks containing quartz, muscovite or lepidolite are most common.
The mud of the Nile, which is the sediment of the matters which the river holds suspended, is destitute of manganese; but it contains, according to the analysis of M. Regnault, six parts in a hundred of oxide of iron; and its colour, at first black, changes to yellowish brown by desiccation and the contact of air. The mud consequently is not the cause of the black crusts on the rocks of Syene.
The clay is sufficiently tenacious to give a considerable degree of consistency to the soil. The internal structure of the hills, as revealed by the deep wells, is similar to that already described. The alternate layers of clay and sand, as well as the oxide of iron, which forms in its various combinations a cement to the sand, allow of extensive tunneling.
It was, therefore the first, the oxide of iron, which they must reduce with coal, that is to say, get rid of the oxygen, to obtain it in a pure state.
If a solution of ferric oxide and manganese ammonium oxalate is submitted to electrolysis, without the previous addition of ammonium oxalate, the characteristic color of permanganic acid immediately makes its appearance, and the peroxide gradually precipitates itself on the positive, while the iron is deposited on the negative electrode.
Shell-lac varnish is the best spirit varnish we have, and may be made any colour by the above process. The English method of preparing the colour in size, which serves as the ground on which the gold is laid, is, to grind together some red oxide of lead with the thickest drying oil that can be procured, the older the better.
Both these varieties have a very irregular texture, including spaces either rounded or angular, full of loose sand: from this cause the surface is always honeycombed. The oxide of iron is most abundant on the edges of the cavities, where alone it affords a metallic fracture.
The drug with which he experimented was nitrous oxide the same that Davy had used; the operation that he rendered painless was no more important than the extraction of a tooth yet it sufficed to mark a principle; the year of the experiment was 1844. The experiments of Dr.
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