=Franklin=, Benjamin, autobiography of, 39; birth, 40; on the disputatious temper, 42; method of learning prose composition, 43; tries vegetarianism, 44; adopts the Socratic method, 44; first voyage to England, 48; experience as a journeyman in London, 49; views on beer as a food, 49; marriage, 54; endeavours to attain moral perfection, 56; method of reconciling an enemy, 60; elected F.R.S., 66; second voyage to England, 70; begins electrical experiments, 72; electrical papers ridiculed by the Royal Society, 73; discovers the effect of points, 74; one-fluid theory of electricity, 76; theory of the Leyden jar, 78; invention of the lightning-rod, 83; golden fish, 85; view of the nature of light, 86; kite, 88; experiments on capacity, 81, 89; experiments on electrical induction, 90; proof of the absence of electricity in a hollow conductor, 91; third voyage to England, 102; examination before the Parliamentary Committee, 105; nominated Foreign Associate of the Academy of Sciences, 110; signs the Declaration of Independence, 113; sent to Paris, 113; made Minister Plenipotentiary to the Court of France, 116; signs the Treaty of Peace, 119; elected President of Pennsylvania, 120; death, 122. Fresnel, awarded the Rumford Medal, 233. Fresnel's repetition of Young's experiments, 225. Friction as a source of heat, Rumford's experiments on, 189. Friday evening lectures instituted by Faraday, 259. G. Galileo and Torricelli on the pressure of the air, 16. Garnett, Dr. Thomas, professor at the Royal Institution, 173. Gilbert, Dr., founder of electrical science, 3. Goettingen, Young's university course at, 206. Graham Bell's telephone, 319. Gray, Stephen, discovers electric conduction, 3. Grimaldi's fringes explained by Young, 222. Gunpowder, Rumford's experiments on, 179. H. Halos, coloured, Young's explanation of, 224. Hawksbee's observations on capillary attraction, 228. Heat, a form of energy, 32; generated by friction in vacuum, 32; generated by friction, Rumford's experiments on, 189. Herapath's explanation of gaseous diffusion, 299. Herschel's, Sir John, comments on Young's principle of interference, 208. Hicks's, Principal, investigations on the influence of temperature on gravitation, 184. Hieroglyphics, Young's work on, 234. Hobbes, opposition of, to Boyle, 25. Hollow conductor, Franklin's experiments on, 91; Cavendish's experiments on, 135; Faraday's experiments on, 270. Honorary degrees conferred on Franklin, 66, 101. Hooke's law, 229. Hooke, Theodore, founds the Royal Society, 14. Huyghens's explanation of double refraction, 219; principle, 218.