ART. 60. HEAT, A MODE OF MOTION 98 " 61. HEAT AND MATTER 100 " 62. RADIATION AND ABSORPTION 104 " 63. HEAT IS A REPULSIVE MOTION 107 " 64. RADIANT HEAT 109 " 65. DIRECTION OF A RAY OF HEAT 111 " 66. LAW OF INVERSE SQUARES 112 " 67. FIRST LAW OF THERMODYNAMICS 114 " 68. SECOND LAW OF THERMODYNAMICS 116 " 69. IDENTITY OF HEAT AND LIGHT 119 CHAPTER VII LIGHT, A MODE OF MOTION ART. 70. LIGHT, A MODE OF MOTION 122 " 71. TRANSVERSE VIBRATION OF LIGHT 130 " 72. REFLECTION AND REFRACTION 135 " 73. THE SOLAR SPECTRUM 139 " 74. DIRECTION OF A RAY OF LIGHT 144 " 75. INTENSITY OF LIGHT 145 " 76. VELOCITY OF LIGHT 148 " 77. DYNAMICAL VALUE OF LIGHT 150 " 78. ELECTRO-MAGNETIC THEORY OF LIGHT 155 CHAPTER VIII AETHER AND ELECTRICITY ART. 79. ELECTRICITY, A MODE OF MOTION 162 " 80. ELECTRIC FIELD 166 " 81. ELECTRIC INDUCTION 174 " 82. ELECTRIC ENERGY 179 " 83. ELECTRIC RADIATION 182 " 84. LAW OF INVERSE SQUARES 184 " 85. SECOND LAW OF ELECTRICITY 186 CHAPTER IX AETHER AND MAGNETISM ART. 86. ELECTRO-MAGNETISM 192 " 87. THE EARTH A MAGNET 195 " 88. THE SUN AN ELECTRO-MAGNET 199 " 89. FARADAY'S LINES OF FORCE 203 " 90. TERRESTRIAL MAGNETISM 206 " 91. SOLAR MAGNETS 211 " 92. CAUSE OF ROTATION OF THE EARTH ON ITS AXIS 219 " 93. VORTEX MOTION 221 " 94. RELATIVE MOTION OF AETHER AND MATTER 224 " 95. VIBRATIONS IN THE ELECTRO-MAGNETIC THEORY OF LIGHT 228 CHAPTER X AETHER AND NEWTON'S LAWS OF MOTION