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versal gravitation was in the air, and hints
and guesses were thrown out by many; and
in time the law of gravitation would doubt-
less have been discovered, though probably
not by the work of one man, even if Newton
had not lived. But, if Kepler had not lived,
who else could have discovered his laws?
FOOTNOTES:
[1] When the writer visited M. D’Arrest,
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