First published in 1962, this volume collects together some of Newton's most important scientific papers. Chosen primarily to illustrate Newton's ideas on the nature of matter, the papers afford valuable insights into Newton's development as a scientist and his ideas of the world that science explores. The six sections are entitled: Mathematics, Mechanics, Theory of Matter, Manuscripts related to the Principia, Education and Notes. Each section has a critical introduction to set the manuscripts in perspective and to discuss their implications. English translations of the Latin documents are given.