Experiments and Observations on Different Kinds of Air: And Other Branches of Natural Philosophy, Connected with the Subject. In Three Volumes: Being the Former Six Volumes Abridged and Methodized, with Many Additions, Volumen 3

Thomas Pearson; and sold by J. Johnson, 1790

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Página 250 - I had that expectation when I first put a sprig of mint into a glass jar standing inverted in a vessel of water: but when it had continued growing there for some months, I found that the air would neither extinguish a candle, nor was it at all inconvenient to a mouse, which I...
Página 252 - Several times I divided the quantity of air in which the candle had burned out. into two parts, and putting the plant into one of them, left the other in the same exposure, contained, also, in a glass vessel immersed in water, but without any plant; and never failed to find, that a candle would burn in the former, but not in the latter. I generally found that five or six days were sufficient to restore...
Página 262 - I took a quantity of air, made thoroughly noxious, by mice breathing and dying in it, and divided it into two parts; one of which I put into a phial immersed in water; and to the other (which was contained in a glass jar, standing in water) I put a sprig of mint. This was about the beginning of August, 1771, and after eight or nine days, I found that a mouse lived perfectly well in that part of the air, in which the sprig of mint had grown, but...
Página 267 - ... the abovementioned causes; yet, if we consider the immense profusion of vegetables upon the face of the earth, growing in places suited to their nature, and consequently at full liberty to exert all their powers, both inhaling and exhaling, it can hardly be thought but that it may be a sufficient counterbalance to it, and that the remedy is adequate to the evil.
Página 253 - This restoration of air I found depended upon the vegetating state of the plant; for though I kept a great number of the fresh leaves of mint in a small quantity of air in which candles had burned out, and changed them frequently, for a long space of time, I could perceive no melioration in the state of the air.
Página 249 - I have been so happy as by accident to hit upon a method of restoring air which has been injured by the burning of candles and to have discovered at least one of the restoratives which Nature employs for this purpose. It is vegetation.
Página 380 - ... the reafon of the attraction which, in many of my experiments, there appears to be between phlogifton and water ; whereas it has been an opinion •univerfally received among chemins, that water has no affinity whatever with phlogifton. From this experiment I had no doubt, but that putting fifties into water impregnated with air that was thoroughly phlogifticated, would be injurious, if not fatal to them, as much as the fame kind of air, in an elaftic ftate, is to land animals ; and this was...
Página 266 - These proofs of a partial restoration of air by plants in a state of vegetation, though in a confined and unnatural situation, cannot but render it highly probable that the injury which is continually done to the atmosphere by the respiration of such a number of animals, and the putrefaction of such masses of both vegetable and animal matter, is in part at least repaired by the vegetable creation. And notwithstanding the prodigious mass of air that is corrupted daily by the abovementioned causes...
Página 346 - I think, proved to be effected by means of the blood, in confequence of its coming fo nearly into contact with the air in the lungs ; the blood appearing to be a fluid wonderfully formed to imbibe, and part with, that principle which the chemifts call phlogifton, and changing its colour in confequence of being charged with it, or being freed from it...

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