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It was, however, rejected by Kunowsky in 1822, and finally overthrown by Beer and Mädler's careful studies during five consecutive oppositions, 1830-39. They identified at each the same dark spots, frequently blurred with mists, especially when the local winter prevailed, but fundamentally unchanged.
AUDUBON, JOHN JAMES. Born near New Orleans, May 4, 1780; published "Birds of America," 1830-39; "Ornithological Biography," 1831-39; "Quadrupeds of America," 1846-54; died at New York City, January 27, 1851.
But Beer and Madler, in 1830-39, identified the same dark spots as being always in the same place, though sometimes blurred by mist in the local winter. The general surface of Mars is a deep yellow; but there are dark grey or greenish patches. Sir John Herschel was the first to attribute the ruddy colour of Mars to its soil rather than to its atmosphere.
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