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238 Electrical separation, 81. when produced, 64. transmuted into visible motion, 124. into electric current, 124. Electro-magnetism, 72. Elastic forces, 50. Electricity, 60. vitreous and resinous, 63. negative and positive, 63. theory of, 63. in motion, 81. transmuted into visible motion, 124. into heat, 125. into chemical separation, 127. Encke's comet, 96. Energies, list of, 78-82. natural, and their sources, 143. Energy, meaning of, 1-22. of bodies in motion proportional to their weight or mass, 14. proportional to the square of the velocity, 19. of visible motion, its transmutation, 87. visible, transformed into absorbed heat, 88. dissipation of, 141. transmutations of, 27. varies as the square of the velocity, 15. of motion, 24. transformed into electrical separation, 98. of position, a sort of capital, 26. Equilibrium, 154. Etiolation, 180.

Fermentation, 183. Food, 145. Force, vital, whence derived, 171. physical, 194. chemical, 194. of chemical affinity, 53. of cohesion, 51. Force, mechanical or molar, 205. molecular, 205. Friction, 35.

Heat, absorbed, changed into chemical separation, 114. into electrical separation, 115. into electricity in motion, 116. Heat-units of different substances, 119. Heat-motion, 80. Heat-engines, their essential conditions, 107. Helmholtz, 141. Heraclitus on energy, 133. Herbivora, 191. Heterogeneity essential in electrical development, 64. Huyghens, 137. Hydraulic press, 32.

Inclined plane, 28. Incubation, 186. Individuals, our ignorance of, 1. Induction, electric, 65. of electric currents, 75. Instability, mechanical, 155. chemical, 156. Intellectual labor, 234.

Joule, 137, 140, 141. Joule's experiments on work and heat, 44.

Kilogrammetre, 16.

Larva, 187. Latent heat, 57. Laws of conservation, 82. Life depends on the sun, 165. Light, a perpetual, impossible, 149. Lime, carbonate, easily decomposed, 58. List of energies, 78-82.

Machines, their true function, 33. animated and inanimate, 157.