In populous cities in sultry weather the ex|halations, from the vaults, privies, sinks, sew|ers, gutters, shambles, slaughter-houses, tan-yards, from respiration, and the combustion of fuel, and a variety of other processes of na|ture and art, are inconceivably great. Nor can such exhalations fail of filling the air with a noxious mass of invisible corpuscles; at the same time that the process by which they are generated spoliates the same atmosphere of a principle, on the presence of which, both life and flame depend for their continuance.—"It is not airThat from a thousand lungs reeks back to thine.Sated with exhalations rank and ell,The spoil of dunghills, and the putrid thawOf nature; when from shape and texture, sheRelapses into fighting elements:It is not air, but floats a nauseous massOf all obscene, corrupt, offensive things;Which still ranker grows with sickly rest,And poisons the balsamic blood."ARMSTRONG on Health.0
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