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Updated: June 21, 2025
He had travelled much in America, and had crossed the Cordilleras to Quito, passing through snow at the highest points. He therefore thought that he could, without great difficulty, carry through his new enterprise; but in this he was mistaken. He had reckoned without the steepness of the inclinations which he had to cross, and the rarefaction of the air.
At the Return of those who convoy'd him, I sent away an Express, to acquaint the Emperor with their Report, which was, That they found no sensible Alteration as to the Rarefaction of the Air, and that the Cold was rather less intense. This News at Court made every one run mad after Shares, which the Proprietors sold at what Rate they pleas'd.
Several hours of palpitation, becoming quite painful, followed; and although the rarefaction of the air was not such as to necessitate recourse being had to the special apparatus for renewing oxygen in the cabins, the cold was excessive. Robur stood in the bow, his sturdy figure wrapped in a great-coat. He gave the orders, while Tom Turner was at the helm.
Brunt was clearly aware of the work of many scientists, notably Boyle, upon the nature and rarefaction of the air. His flyers proceed by slow stages, accustoming themselves gradually to the rarefied air, assisting their respiration by the use of wet sponges.
Q. How is it that the heart is continually moving? A. Because in it there is a certain spirit which is more subtle than air, and by reason of its thickness and rarefaction, seeks a larger space, filling the hollow room of the heart; hence the dilating and opening of the heart, and because the heart is earthly the thrusting and moving ceasing, its parts are at rest, tending downwards.
How can we suppose an electrical explosion without some vapours collected together, capable of containing unequal charges of electricity, in air, the mean temperature of which is perhaps 25 degrees below the freezing point of the centigrade thermometer, and the rarefaction of which is so considerable, that the compression of the electrical shock could scarcely disengage any heat?
This westerly wind is evidently produced by the air drawn actually from the equator towards the slower moving latitudes of the earth, by the rarefaction of the air to the southward when the sun is near the tropic of Capricorn. "The south-east monsoon predominates from April to October in the space last mentioned, and in some places reaches to the equator."
Might not the apparent repulsion of diamagnetic bodies be really due to the greater attraction of the medium by which they are surrounded? He tries the rarefaction of air, but finds the effect insensible. He is averse to ascribing a capacity of attraction to space, or to any hypothetical medium supposed to fill space.
The object was about one point before the weather beam, and was so far away that the rarefaction of the air imparted to it a wavering indistinctness of aspect that rendered it quite unrecognisable.
Hence he concluded that, with a sufficient rarefaction, air might turn into fire, and that this probably was the origin of the sun and stars, blazing comets, and other meteors; but if by chance it should undergo condensation, it would turn into wind and clouds, or, if that operation should be still more increased, into water, snow, hail, and, at last, even into earth itself.
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