22 CONTENTS. 



THE PRINCIPLE. 



PAGE 



Reception of the Principia 548 



Is Gravitation proportional to Quantity of Matter ? 549 



VERIFICATION AND COMPLETION OF THE NEWTONIAN THEORY. 



Tables of the Moon and Planets 550 



The Discovery of Neptune 554 



The Minor Planets 557 



Anomalies in the Action of Gravitation 560 



The Earth's Density 561 



Tides 562 



Double Stars 563 



INSTRUMENTS. 



Clocks . . 665 



