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Rh

Eccentricity, orbital—cont. of satellites, increases with distance from primary, 134. Eclipsing binaries, 3, 4. Ejectum from nova, 5, 16. rate of regression, 16. Elemental substances, 159. in Sun, 159. once in Earth, 160. discovery of, in stars, 161, 162. Ellipticity, of Jupiter, 103. of Saturn, 109. of Uranus, 115. Encke, 68. Energy, conservation of, 140, 150, 151. dissipation, 140-142. conditions for a minimum, 142. Eros, fluctuation of light of, gives evidence of form, 101, 102. Evolution, 153. white nebulæ in process of, 49. rounded out, 56. of solar family, 100. evidence of, in solar system, 117. manner of, lessens energy, 141. Evolution, chemical, 155, 173. universal, 156. temperature conducive to, 157, 158. attendant upon cooling, 158, 162. steps in, shown by spectroscope, 161. Evolution, physical, 155, 162. induced by cooling, 162.

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.