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Absorbed heat changed into chemical separation, 114. into actual visible energy, 105. into light and beat, 117. Acquisition, 232. Actinic rays, 129. Action and reaction equal and opposite, 8. Affinity, chemical, 53. Air and water in motion, 147. Albuminoids, 177, 183. Amber, 61. Ampere, 75. Amyloids, 177, 183. Ancients, their ideas not prolific, 135. Andrews, 141. Animal heat, 207. Animals, how they live, 188. Animals and inanimate machines, 165. Aristotle on a medium, 134. on mind and body, 207. Atmospheric circulation, 109. Atomic forces and heat, 58. Atomic or chemical separation, 80. Atoms and molecules, 51. Attention, 232. Attraction, molecular, 52. mutual, of atoms, 64. and repulsion of magnets, 75. of electric currents, 75. Bacon, 133, 137. Battery of Grove, 70. Budding, 180.

Caloric, 38. Carnivora, 189. Chemical affinity, 53. and electrical attraction, 64. and heat, 58. Chemical combination producing heat, 119. Chemical instability, 156. Chemical separation converted into electrical separation, 122. into electricity in motion, 123. Chlorophyll, 177. Chrysalis, 187. Circulation of the atmosphere, 109. Clausius, 141. Cohesion, force of, 51. Cold apparently produced by the electric current, 126. Conduction of electricity, 61. Conservation, laws of, 82. theory of, 140. Crossbow and watch-spring, 25. Current, the electric, 69. and magnetism, 72. heating effect of, 73. chemical effect of, 74. Currents, electric, attraction and repulsion of, 74. induction of, 75.

Dalton, 133. Davy, Sir Humphrey, 38, 137. Democritus on atoms, 133. Descartes, 136. Diastase, 184. Disease-germs, 3. Dissipation of energy, 141. Dissociation, 116.

Egg, development of the, 186. Electric current, 69. and magnetism, 72. heating effect of, 73. chemical effect of, 74. induction, 65. Electrical attraction and chemical affinity, 64.