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the heavens, when Secchi and Huggins stud-
ied the chemistry of the stars by means of
the spectroscope, and when Warren De la
Rue set up a photoheliograph at Kew, we
see that a progress in the same direction as
before, in the evolution of our conception
of the universe, was being made. Without
definite expression at any particular date, it
came to be an accepted fact that not only
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