 After making a mistake and producing a different result he corrected his work and obtained his former result.Next November, Newton redeemed his promise to Halley by sending him, by the hand of Mr. Paget, a fellow of Trinity College and mathematical master of Christ's Hospital, a copy of his demonstration; and very soon afterward Halley again visited Cambridge to confer with Newton about the problem.On his return to London on 10 December 1684, he informed the Royal Society "that he had lately seen Mr. Newton at Cambridge, who had shown him a curious treatise "De Motu"", which at Halley's desire he promised to send to the Society to be entered upon their register.