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The carbon in the soil tends gradually to oxidise and to disappear, except where water accumulates and the climate is cool; so that in the oldest pasture-land there is no great excess of organic matter, notwithstanding the continued decay of the roots and the underground stems of plants, and the occasional addition of manure.
I'm quite sure that a large number of people are worrying over that article, and asking how they can oxidise if not their own cerebellum, at all events that of their offspring." "Man and nature," said Lord Dymchurch presently, "have such different views about the good of the world." "That," exclaimed the baronet, "is a very striking remark. Let me give you an illustration of its truth.
Many of the best Egyptian bronzes offer a surprising resistance to damp, and oxidise with difficulty. While yet hot from the mould, they were rubbed with some kind of resinous varnish which filled up the pores and deposited an unalterable patina upon the surface. Each kind of bronze had its special use.
Now the effect of this will be that the dyestuff, partly in the fibre as a proper dye, and not a little on the fibre as if "smudged" on or painted on, will, on exposure to the weather, moisture, air, and so on, gradually oxidise, the great preponderance of iron on the fibre changing to a kind of iron-rust, corroding the fibres in the process, and thus at once accounting for the change to the ugly brownish shade, and to the rubbing off and rapid wearing away of the already too thin superficial coating of dyed felt fibre.
The combustible metal that is, the lead and the part that will oxidise, are thoroughly oxidised; the litharge would flow out in a fused state into a vessel placed to receive it, and the platinum remains behind. Here is the process which Deville adopts for the purpose of casting off the lead, after he has got out the platinum from the ore.
This depends upon its nervous mechanism, and upon sleep, and not upon the muscular system and chemical combustion. To my mind, this is one of the most curious paradoxes of modern science. No matter how much food we may eat and perfectly oxidise, there comes a time, nevertheless, when we must go to bed, and not to the dining-room, to recuperate our strength and energies.
All that was necessary was that the materials employed should be in contact with each other under a slight but definite pressure, and, for the continuance of the effects, that the materials should not oxidise in air so as to foul the contact.
How can you keep an angel in a cage? "Aeroplane!" I almost whispered to Bickley. "You've got it!" he answered. "The framework of an aeroplane and a jolly large one, too. Only why hasn't it oxidised?" "Some indestructible metal," I suggested. "Gold, for instance, does not oxidise." He nodded and said: "We shall have to dig it out. The dust is feet thick about it; we can do nothing without spades.
The same action effects the elimination of the arsenic and antimony associated with gold and silver ores, as when heated to a certain constant temperature these metals readily oxidise.
Here it is roasted for a period ranging from twelve to twenty-four hours, after which it is drawn into the ash-pit, where it remains to cool. In this state, the ore is a black, amorphous substance, and is termed calcined ore. The object of this process is to oxidise the extraneous metals, and also to reduce the quantity of sulphur, by driving it off in the form of vapour.
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