“That the vegetable creation should restore the air which is spoiled by the animal part of it, looks like a rational system, and seems to be of a piece with the rest.”

— Benjamin Franklin

"Letter to Joseph Priestley" in response to Priestley's "experiments on the restoration of air [by plants] made noxious by animals breathing it, or putrefying it..." read in Philosophical Transactions LXII 147-267 of the Royal Society (1772) and quoted in John Towill Rutt, Life and Correspondence of Joseph Priestley http://books.google.com/books?id=psMGAAAAQAAJ... Vol.1 (1831).
Context: That the vegetable creation should restore the air which is spoiled by the animal part of it, looks like a rational system, and seems to be of a piece with the rest. Thus fire purifies water all the world over. It purifies it by distillation, when it raises it in vapours, and lets it fall in rain; and farther still by filtration, when keeping it fluid, it suffers that rain to percolate the earth. We knew before that putrid animal substances were converted into sweet vegetables when mixed with the earth and applied as manure; and now, it seems, that the same putrid substances, mixed with the air, have a similar effect. The strong, thriving state of your mint, in putrid air, seems to show that the air is mended by taking something from it, and not by adding to it. I hope this will give some check to the rage of destroying trees that grow near houses, which has accompanied our late improvements in gardening, from an opinion of their being unwholesome. I am certain, from long observation, that there is nothing unhealthy in the air of woods; for we Americans have everywhere our country habitations in the midst of woods, and no people on earth enjoy better health or are more prolific.

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Benjamin Franklin 183

American author, printer, political theorist, politician, p… 1706–1790

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“That the vegetable creation should restore the air which is spoiled by the animal part of it, looks like a rational system, and seems to be of a piece with the rest.”

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Benjamin Franklin 183

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