F Fabry, 34. Fauna, 178, 179, 187. Faye, 175, 176. Flagstaff, Arizona, 52, 66, 68, 79, 83, 89, 92, 106, 110, 221, 232. clear and steady air of, 66, 86. Flamstead, 119. Fleming, Mrs., 7. Flemming, 120, 121. Flora, of paleologic times, 177. French Academy, 122. G Galle, Dr., 122, 123, 125. Gases, peculiar to nebulæ, 11, 16. occluded in meteorites, 42, 43. in atmospheres of planets, 53-55. Gauss, 34, 96, 97. Geikie, 160, 177, 189. Geology, relation to astronomy, 173, 174, 183, 184. scope of, 174, 203. Geysers, avenues to earlier state, 160. Goodricke, 3. H Hakluyt, 188. Harvard College Observatory, 8, 12. Heat, molecular motion, 150, 157, 230. the result of evolving, 153. the preface to higher evolution, 153, 156. laws governing amount of, 190. atmosphere keeps out, as well as stores, 191. effective, received from Sun, 192-194. invisible rays, 194. retained, 194-196. radiated, 194-196. Heat of condensation of Earth, accuses concourse of particles, 151. evaluated, 151, 152. sufficient for geologic phenomena, 152. Hector, 94. Helmholtz, 151. Hencke, 98. Herschel, Sir John, 122. Herschel, Sir William, 96, 114, 162. Hertha, periodic variability, 102. Hipparchus, 5. Holden, 9. Hubbard, Professor, 124. Huggins, 52. Humphreys, 10. Huntington, 209. I Ice Age, 196. not of orbital occasioning, 197-199. increased precipitation, the cause, 199, 200. a local affair, 200-202. Irradiation, affecting diameter of Mercury, 66, 68. J Jacobi, Notes 252. Julius, Professor, 10. Juno, 101. Jupiter, 103-108. not solid, 104, 107. a semi-sun, 105, 108, 152, 166, 167. white spots of, 106. Jupiter, “great red spot” of, 164. time of rotation, 164. a vast uprush of heated vapor, 165, 166. Jupiter’s belts, secular progression, 104. rotate at different speeds, 104, 162, 163. color, 104. wisps across, 105, 106. bright ones, cloud, 163, 167. spectrographic study of, 166. K Kapteyn, 14. Keeler, 19, 52, 110. Kepler, 6. Kinetic theory of gases, 226, 228. corollary of, 54. extension of, 230, 231. Kirkwood, Professor, 35.