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act values of the masses of Jupiter and Sat-
urn, his prediction was correct within two
days, after an invisible voyage of seventy-
five years!
Hind afterwards searched out many old
appearances of this comet, going back to
11 B.C., and most of these have been iden-
tified as being really Halley’s comet by the
calculations of Cowell and Cromellin[4] (of
301