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between Whewell and Brewster as to the
habitability of the planets. The new argu-
ments are not yet generally accepted. Low-
ell believes he has, with the spectroscope,
proved the existence of water on Mars.
One of the most unexpected and inter-
esting of all telescopic discoveries took place
in the opposition of 1877, when Mars was
unusually near to the earth. The Wash-
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