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Sr. Iſaac had all the qualifications for a philoſopher the acumen, the patience, & the judgmt. necessary: at the ſame time, he had a natural geometry able to ſurmount all difficultys. he neither began with Euclid, or ſuch like introductions but cd. demonſtrate on sight. & at 24 yrs of age had laid the foundation of his two great diſcoverys, the principia philoſ. mathemat. & of his optics: & then had invented the wonderful method of infinite series, or fluxions.
