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Updated: May 15, 2025
During the prevalence of dry winds, the earth in many districts of India becomes frosted over with nitrous efflorescences, and the great quantity shipped from the commercial ports, and that consumed in China, is thus a natural production of that region.
But what surprised me more than I can express was that a candle burned in this air with a remarkably vigorous flame, very much like that enlarged flame with which a candle burns in nitrous oxide, exposed to iron or liver of sulphur; but as I had got nothing like this remarkable appearance from any kind of air besides this particular modification of vitrous air, and I knew no vitrous acid was used in the preparation of mercurius calcinatus, I was utterly at a loss to account for it."
It came first by mesmeric hypnotism, which was applicable only to a few, and was restricted, by the jealous hostility of the old medical profession. Then came the nitrous oxide, introduced by Dr. This was largely superseded by chloroform, discovered much earlier by Liebig and others, but introduced as an anæsthetic in 1847, by Prof. Simpson.
Those that have been found in the most perfect state of preservation were deposited in nitrous caves, and were enveloped in a manner so different from the practices of the Indians, that the idea cannot be entertained of their being the remains of the ancestors of the present race. Flint gives the following description of one of them which he carefully examined.
That person found our door locked, knew it would be locked, knew that I always locked it. Knowing that such was the case, this person came prepared, bringing perhaps, a tank of compressed nitrous oxide, certainly the materials for making the gas expeditiously." I began to understand how it had been done. "Through the keyhole," he resumed, "a stream of the gas was injected.
Gringalet's tongue hung out of his mouth; he found the journey over the nitrous soil very irksome, and the scanty leaves of the mimosa failed to screen him from the sun. What a contrast it was to the pleasant regions we had hitherto travelled through! "Your country, after all, is not so nice a one as mine," said Lucien, addressing l'Encuerado.
"In this case also, though I did not give sufficient attention to the circumstance at that time, the flame of the candle, besides being larger, burned with more splendour and heat than in that species of nitrous air; and a piece of red-hot wood sparkled in it, exactly like paper dipped in a solution of nitre, and it consumed very fast an experiment which I had never thought of trying with nitrous air."
Thus, while during chloroform anæsthesia the arterial pressure markedly falls, such is not the case during anæsthesia produced by ether or a mixture of nitrous oxide and oxygen. The arterial pressure of man is not lowered by the ordinary fatigue of daily life. It is only in extreme states of exhaustion that the pressure may be found decreased when the subject is in the standing position.
Alma took the bit of glass he offered her, but declared she couldn't see anything but a dirty spot on the glass. "That's the negative. Let me copy it, and then I'll throw it up with the stereopticon." He selected another bit of glass from a box, and in a few minutes had it prepared and the two put together and laid in the sun on the window-seat. "What's in that iron box, Elmer?" "Nitrous oxide."
=Irritant Gases= are Nitrous acid gas; sulphurous acid gas; hydrochloric acid gas; chlorine; bromine; ammonia. They have the common property of causing irritation and inflammation of the eyes, throat, and air-passages, and may cause spasm of the glottis, bronchitis, and pneumonia. =Sulphurous Acid Gas.= One of the products of combustion of common coal.
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