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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
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