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Nov 09, 2010 11:57

The air is soft and bland, and a mild temperature prevails, while the atmosphere is filled with a dense, dry haze, that causes the distant objects of the landscape to appear as if veiled in a cloud of smoke.

This obscurity has been supposed by some writers to originate in the same way as aqueous mists; while others imagine it to be due to the presence of smoke, borne by the wind from the distant conflagrations of vast prairies and forests.

The Indian summer, with its genial warmth and misty veil, occurs at that period of the year when the leaves of the forest are falling, and the vegetation that covers the surface of the earth is beginning to decay. In view of this fact, the author was led to think, some years ago, that the decomposition of the decaying vegetation, which Leibig terms a slow combustion, (eremacausis), might impart that peculiar haziness to the atmosphere which is seen during the Indian summer. This phenomenon was ascribed to the same cause by another observer, Dr. E. B. Haskens, of Clarksville, Tenn., who also "suggests," that the Indian-summer haze consists of carbonaceous matter or smoke produced by the oxidation of the lifeless vegetation.

-John Brockelsby, Elements of Meteorology, 1873

Oct. 19. P. M. - To Pine Hill for chestnuts.
It is a very pleasant afternoon, quite still and cloudless, with a thick haze concealing the distant hills. Does not this haze mark the Indian summer?

-Henry David Thoreau, Journal, 1855
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