The book is divided into nine parts—Natural Philosophy, Scientific Method, Experimental Procedure, Optics, Rational Mechanics, Systems of the World, Alchemy and Theory of Matter, Theology, and Mathematics. Text and commentary are woven together, enabling readers to concentrate on the aspects of Newton's astoundingly diverse career they prefer. For each part, the editors provide an introductory essay and textual annotation. In addition, the text is amply illustrated. The General Introduction to the book sketches Newton's life and offers an interpretation of his scientific achievements. The Biographical Register identifies the many people Newton cites in his writings. The Glossary and Glossary of Chemical Terms explicate scientific terms and concepts. Finally, the Selected Bibliography offers suggestions for further readings of and about Newton.