NEWTONIAN PERIOD.
Sect. 1. Instruments. 470 Sect. 2. Observatories. 476 Sect. 3. Scientific Societies. 478 Sect. 4. Patrons of Astronomy. 479 Sect. 5. Astronomical Expeditions. 480 Sect. 6. Present State of Astronomy. 481
ADDITIONS TO THE THIRD EDITION.
INTRODUCTION 489
History of the Inductive Sciences, From the Earliest to the Present Time · The Wunder Library — complete classics, free to read, with narration.