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to commit to writing, and present to the
Royal Society, the results of his investiga-
tions. But for his friendly insistence it is
possible that the Principia would never
have been written; and but for his generos-
ity in supplying the means the Royal Soci-
ety could not have published the book.
[Illustration: DEATH MASK OF SIR
ISAAC NEWTON. Photographed specially
275