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How often in churches there are men professing to be eager for the glory of God, who are, perhaps half-unconsciously, using it as a stalking-horse, behind which they may shoot game for their own larder! A drop of quicksilver oxidises and dims as soon as exposed to the air. The purest motives get a scum on them quickly unless we constantly keep them clear by communion with God.
To apply it on new plates use nitric acid applied with a swab to free the surface of the copper from oxides or impurities, then rub the ball of amalgam over the surface using some little force. It is always well when coating copper plates with silver or zinc by means of mercury to let them stand dry for a day or two before using, as the mercury oxidises and the coating metal more closely adheres.
"I don't quite know." "Oxide of iron," said the Vicar. "Oh yes," cried Tom eagerly; "I'd forgotten." "Well," said Uncle Richard, "the oxide of iron is Nature's action upon the iron. Man produces iron by heat from the ore, but unless great care is used to protect it from the action of the atmosphere, it is always going back to a state of nature oxidises, or goes back into a salt of iron.
I suppose you had some good reason for so doing?" remarked the colonel, chiming into the conversation. "I had no less than three good reasons for leaving the hull of the ship unpainted," answered the professor. "In the first place, aethereum is quite insensible to the attacks of air and water it never oxidises, and paint was therefore unnecessary for its preservation.
The rain washes down the little earth that there is on the hillside, the chemical action of the limestone oxidises the same, and the so-called "terra rossa" is formed in these depressions, sufficient to give nourishment to the trees and bushes which grow there.
Every truth has its counterfeit. Neither institutions, nor principles, nor movements, nor individuals, bear unmingled crops of good. Not merely creatural imperfection, but hostile adulteration, marks them all. The purest metal oxidises, scum gathers on the most limpid water, every ship's bottom gets foul with weeds.
We find that some organisms produce as a result of their chemical life material which oxidises and gives out light and so these organisms are "phosphorescent" without any consequence, good or bad, to themselves.
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