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

CHAPTER III

MATTER

ART. 29. WHAT IS MATTER? 40
" 30. CONSERVATION OF MATTER 42
" 31. MATTER IS ATOMIC 42
" 32. WHAT IS AN ATOM? 43
" 33. THE ATOMIC THEORY 44
" 34. KINDS OF ATOMS 44
" 35. ELEMENTS OF MATTER 47
" 36. THREE KINDS OF MATTER 47
" 37. MATTER IS GRAVITATIVE 50
" 38. MATTER POSSESSES DENSITY 51
" 39. MATTER POSSESSES ELASTICITY 51
" 40. MATTER POSSESSES INERTIA 52

CHAPTER IV

AETHER

ART. 42. AETHER IS MATTER 54
" 43. AETHER IS UNIVERSAL 58
" 44. AETHER IS ATOMIC 59
" 45. AETHER IS GRAVITATIVE 64
" 46. AETHER POSSESSES DENSITY 71
" 47. AETHER POSSESSES ELASTICITY 74
" 48. AETHER POSSESSES INERTIA 76
" 49. AETHER IS IMPRESSIBLE 78
" 50. AETHER AND ITS MOTIONS