4. THE REIGN OF EPICYCLES--FROM PTOLEMY TO COPERNICUS

BOOK II. THE DYNAMICAL PERIOD

5. DISCOVERY OF THE TRUE SOLAR SYSTEM--TYCHO BRAHE--KEPLER

6. GALILEO AND THE TELESCOPE--NOTIONS OF GRAVITY BY HORROCKS, ETC.

7. SIR ISAAC NEWTON--LAW OF UNIVERSAL GRAVITATION

8. NEWTON'S SUCCESSORS--HALLEY, EULER, LAGRANGE, LAPLACE, ETC.

9. DISCOVERY OF NEW PLANETS--HERSCHEL, PIAZZI, ADAMS, AND LE
VERRIER

BOOK III. OBSERVATION


10. INSTRUMENTS OF PRECISION--SIZE OF THE SOLAR SYSTEM

11. HISTORY OF THE TELESCOPE--SPECTROSCOPE

BOOK IV. THE PHYSICAL PERIOD

12. THE SUN

13. THE MOON AND PLANETS

14. COMETS AND METEORS