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His correspondents, abroad and at home, were numerous; nor did he disdain to remove the perplexities of amateurs. In a letter, dated January 6th, 1794, we find him explaining to Mr. J. Miller of Lincoln’s Inn, “the circumstances which attend the motion of a race-horse upon a circle of longitude.” And he wrote shortly afterwards to Mr. Smith of Tewkesbury:—“You find fault with the principles of gravitation and projection because they will not account for the rotation of the planets upon their axes. You might certainly with as much reason find fault with your shoes because they will not likewise serve your hands as gloves. But, in my opinion, the projectile motion once admitted, sufficiently explains the rotatory motion; for it is hardly possible mechanically to impress the one without giving the other at the same time.”

On religious topics he was usually reticent; but a hint of the reverent spirit in which his researches were conducted may be gathered from a sentence in the same letter. “It is certainly,” he said, “a very laudable thing to receive instruction from the great workmaster of nature, and for that reason all experimental philosophy is instituted.”