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1 “He was contemplative rather than speculative. He wanted something solid to rest upon, and hence his bias for mathematics and the physical sciences. He bestowed more attention on them than upon metaphysical speculations. I have heard him descant upon the problem whether a ball discharged from a gun in a horizontal position would be longer in reaching the ground than one dropped at the instant of discharge from the muzzle. He said it always appeared to him that they would both reach the ground at the same time, even before he had read the philosophical explanation.” --Joseph Gillespie, letter, December 8, 1866, Ms.
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