This volume contains the Proceedings of the International Colloqui- um "Newton's Scientific and Philosophical Legacy", that was held at the Catholic University of Nijmegen (The Netherlands) from June 9th to 12th 1987 to celebrate the Tercentenary of the publication of Newton's Philo- sophiae Naturalis Principia Mathematica (1667). Although 1987 was a busy year for Newton scholars, we were happy that five of most prom- inent among them were able to come to Nijmegen and speak on the vari- ous aspects of Newton's thought. They are the Professors I. Bernard Cohen (Harvard), Gale Christianson...