A discourse on comets : Containing, a brief description of the true system of the world, ... Extracted from the writings of Sir Isaac Newton, and other astronomers. To which is added, the opinion of that illustrious author, concerning the use of comets, the origin of matter; and his definition of the supreme being of the universe. Collected by J. L. Cowley. - Cowley, John Lodge (printed for the author, at the Academy; and sold by J. Payne, 1757)