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identification of their law of force with New-
ton’s force of gravitation applied to the so-
lar system, and the force that makes an ap-
ple fall to the ground. As Grant well says in
his History : ”This may be justly asserted
to be one of the most sublime truths which
astronomical science has hitherto disclosed
to the researches of the human mind.”
Latterly the best work on double stars
604