Title: Mathematical elements of natural philosophy, confirm'd by experiments; or, an introduction to Sir Isaac Newton's philosophy. Vol.I. Written in Latin, by William-James 'sgravesande, Doctor of Laws and Philosophy, Professor of Mathematicks and Astronomy at Leyden, and Fellow of the Royal Society of London. Translated into English, by J.T. Desaguliers, LL. D. Fellow of the Royal Society, and Chaplain to his Grace the Duke of Chandos.