Page:The Mathematical Principles of Natural Philosophy - 1729 - Volume 1.djvu/17

Rh. ''his olicitations that its becoming publick is owing. For when he had obtained of me my demontrations of the figure of the celetial orbits, he continually preed me to communicate the ame to the Royal Society; who afterwards, by their kind encouragement and entreaties, engaged me to think of publihing them. But after I had begun to conider the inequalities of the lunar motions, and had entered upon ome other things relating to the laws and meaures of gravity, and other forces; and the figures that would be decribed by bodies attracted according to given laws; and the motion of everal bodies moving among themelves; the motion of bodies in reiting mediums; the forces, denities, and motions of mediums; the orbits of the Comets, and uch like; I put off that publication till I had made a earch into those matters, and could put out the whole together. What relates to the Lunar motions (being imperfect) I have put all together in the corollaries of prop. 66. to avoid being obliged to propoe and ditinctly demontrate the everal things there contained in a method more prolix than the ubject deserved, and interrupt the eries of the everal propositions. Some things,''