Facts and ideas, _a._ 43. Faults (in strata), _b._ 537. Final causes, _b._ 442, 492. Finite intervals (hypothesis of), _b._ 126. First law of motion, _a._ 322. Fits of easy transmission, _b._ 77, 89. Fixed air, _b._ 272. Fixity of the stars, _a._ 158. {35} Formal optics, _b._ 52. Franklinism, _b._ 202. Fresnel's rhomb, _b._ 105. Fringes of shadows, _b._ 79, 125. Fuga vacui, _a._ 347. Full months, _a._ 122. Function (in Physiology), _b._ 435. Galvanism, _b._ 239. Galvanometer, _b._ 251. Ganglionic system, _b._ 463. Ganglions, _b._ 463. Generalization, _a._ 46. Geocentric theory, _a._ 258. Gnomon, _a._ 162. Gnomonic, _a._ 137. Golden number, _a._ 123. Grave harmonics, _b._ 38. Gravitate, _a._ 406. Habitations (of plants), _b._ 562. Hæcceity, _a._ 233. Hakemite tables, _a._ 177. Halogenes, _b._ 308. Haloide, _b._ 352. Harmonics, Acute, _b._ 37. " Grave, _b._ 38. Heat, _b._ 139. " Latent, _b._ 160. Heccædecaëteris, _a._ 121. Height of a homogeneous atmosphere, _b._ 34. Heliacal rising and setting, _a._ 131. Heliocentric theory, _a._ 258. Hemisphere of Berosus, _a._ 162. Hollow months, _a._ 122. Homoiomeria, _a._ 78. Horizon, _a._ 131. Horoscope, _a._ 222. Horror of a vacuum, _a._ 346. Houses (in Astrology), _a._ 222. Hydracids, _b._ 283. Hygrometer, _b._ 177. Hygrometry, _b._ 138. Hypostatical principles, _b._ 262. Iatro-chemists, _b._ 263. Ideas of the Platonists, _a._ 75. Ilchanic tables, _a._ 178. Impressed forces, _a._ 359. Inclined plane, _a._ 313. Induction (electric), _b._ 197. " (logical), _a._ 43. Inductive, _a._ 42. " charts, _a._ 47. " epochs, _a._ 46. Inflammable air, _b._ 273. Influences, _a._ 219. Intercalation, _a._ 118. Interferences, _b._ 86, 93. Ionic school, _a._ 56. Isomorphism, _b._ 334. Isothermal lines, _b._ 146, 538. Italic school, _a._ 56. Joints (in rocks), _b._ 537. Judicial astrology, _a._ 222. Julian calendar, _a._ 118. Lacteals, _b._ 453. Latent heat, _b._ 160. Laws of motion, first, _a._ 322. " " second, _a._ 330. " " third, _a._ 334. Leap year, _a._ 118. Leyden phial, _b._ 196. Librations (of planets), _a._ 297. Libration of Jupiter's Satellites, _a._ 441. Limb of an instrument, _a._ 162. Longitudinal vibrations, _b._ 44. Lunisolar year, _a._ 120. Lymphatics, _b._ 453.