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172 Dr. Boerhaave obferves, may be confidered as a chaos containing particles of all kinds of matter. And, here it may be obferved, that the feveral fluids that are diffolved in the air, will probably diffolving and taking up the fubtile effluvia, which sire carried off from volatile bodies. The air, we find,

is neceffary for the prefervation of animal life; but when it has paffed two or three times through the lungs of an animal, it becomes unfit for refpiration, and an animal inclofed in fuch air will foon expire: whether the air we breathe depofites in our lungs any kind of matter neceffary to the fupport of life, -I cannot pretend to judge. But I think we may be fure

that one purpofe for which air was deligned, is the carrying off that moiflure, and other perfpirable

matter, which conflantly exhales from the lungs. Now as air lobes nothing of its elallkity, by pafling through the lungs, it will flill continue fit for fuch purpoks, in the animal occonomy, as may be anfwered by the alternate expanflon and contraftion of the lungs in reqnration. And, therefore, I befieve that

air is rendered unfit for refpiration, chiefly by being laturated with that moillure, and other perfpirable nutter, which it meets with in the lungs, and thereby kiting its power of diffolving, and carrying off any more of that kind of matter, which will then continually inmate and clog the lungs, fo that an animal inclofed in fuch air will die, perhaps Comewhat in the fame manner, though not lo quickly as if it had been drowned. Does it not feem probable that, in the conflant raid quick evaporation of moifture from the lungs. franc degree of cold may be produced, as A is in other

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