CHAPTER II. Philosophy of Gravitation--(_continued_)

PHILOSOPHY OF GRAVITATION--(continued)

ART. 18. GRAVITATION ATTRACTION 24 " 19. UNIVERSALITY OF GRAVITATION 24 " 20. DIRECTION OF THE FORCES 26 " 21. PROPORTION OF THE FORCES 26 " 22. LAW OF INVERSE SQUARES 27 " 23. TERRESTRIAL GRAVITY 29 " 24. CENTRIFUGAL FORCE 30 " 25. KEPLER'S LAWS 32 " 26. FIRST LAW OF KEPLER 33 " 27. SECOND LAW OF KEPLER 36 " 28. THIRD LAW OF KEPLER 37