Newton studies have undergone radical changes in the last half-century as more of his work has been uncovered and more details of his life and intellectual context have come to light. This volume singles out two strands in recent Newton studies: the intellectual background to Newton's scientific thought and both specific and general aspects of his technical science. The essays make new claims concerning Newton's mathematical methods, experimental investigations, and motivations, as well as the effect that his long presence had on science in England. The book is divided into two parts. The essays in part I shed new light on Newton's motivations and the sources of his method. The essays in part II explore Newton's mathematical philosophy and his development of rational mechanics and celestial dynamics. An appendix includes the last paper by Newton biographer Richard W. Westfall, examining some of the ways that mathematics came to be used in the age of Newton in pursuits and domains other than theoretical or rational mechanics.