INDEX. CXX1 



Colebrooke, on the height of the snow line on the two declivities of the Himalaya, 

 Note 5. 



Colladon, electro-magnetic apparatus, p. 333. 



Columbus, found no variation of the compass near the Azores in 1492, p. 170, 171 ; 

 Note 151. Remarks that palms and pines grow together on the coast of 

 Cuba, and distinguishes Podocarpus from Pinus, p. 272; Note 329. His 

 notice of the equatorial current, p. 300 ; Note 370. Of the Sargasso sea or 

 portion of the ocean covered with Fucus natans, p. 301. His dream, p. 304 ; 

 Note 374. 



Comets, general account of, p. 91105 ; Notes 4257. Supposed danger of their 

 collision with the earth, p. 24, 25, 100. Small density of, p. 77, 96 ; Notes 

 49, 50. Multitude of, p. 91. Small mass of, p. 100. Paths of, and distances 

 from the sun, p. 98104, 133. Chinese accounts of, p. 92, 93 ; Notes 42, 77. 

 Fears occasioned by, in former times, 104, 105 ; Note 57. Imaginary connec- 

 tion of, with a fine vintage, p. 105. Examination of the light of, by chromatic 

 polarisation, p. 97 ; Note 51. Changes in the appearance of comets and appa- 

 rent vibrations in tails, p. 94, 95, 91, 132 ; Notes 45, 46, 99. Comets of short 

 period, p. 99102. Of long period, 102. Comet seen in Persia in 1683, and 

 called " nyzek," or small lance, p. 129; Note 92. Biela's, p. 25, 77, 99, 104, 

 Blanpains, p. 101. Clausen's, 101. Encke's, p. 24, 25. The existence of a 

 resisting medium inferred from the diminishing period of revolution of 

 Encke's comet, p. 24, 77, 98, 99. Faye's, p. 101. Halley's, p. 94, 97, 99, 101, 

 102. Lexell and Burkhardt's, p. 101, 103. Messier's, p. 101. Olbers's, 

 102. Pons's, p. 102. Possible encounter of Biela's and Encke's comets, 

 p. 100. Comet of 1843, p. 94 ; Note 43. 



Compass, early knowledge by the Chinese, p. 169. 



Condamine (La), inscription on a monument at Quito on the length of the seconds* 

 pendulum at the equator, and on the Peruvian arc of the meridian, Note 131. 



Conde", notice of a great fall of aerolites seen in Arabia in October 902, Note 66. 



Coraboenf and Delcros, geodesic determinations near the line of the Pyrenees, 

 shewing that no sensible difference of level exists between the Atlantic and 

 Mediterranean, p. 297 ; Note 366. 



Cordilleras, scenery and vegetation of the, p. 9, 1113. 



Cosmos, author's purpose in the essay on the, p. 32, 5760. Discussion of the 

 term, and of the meaning of the science of the, p. 5558, 68 ; Note 27. 



Cosmography, p. xix, of the Author's Preface. P. 57, 7379. 



Craters of elevation, p. 214216; Note 211, 212. See Volcanoes. 



Curtius, temperatures of several springs in Greece, Note 206. 



Cuvier (George), with Brongniart, pre-eminently the founders of the science of 

 fossil geology, p. 262, 264. Fossil crocodiles in tertiary formations, p. 263. 



Daimachos, fall of the stone of Mgos Potamos, Note 87. 



Dalman, on the Chionaea araneoides found in snow, p. 344. 



Dalton observed aurora australis in England, p. 183. On the dew-point, p. 330. 



Daniell, on the dew-point, p. 330. 



Darwin (Charles), on vegetable fossils in the travertin of Van Diemen Island, 

 p. 212. Analogy of the floras of the southern temperate regions with fossil 

 floras, p. 272 ; Note 330. On changes of level in the sea bottom of the Pacific, 

 p. 288; Note 355. On the abundance of organic life in the ocean, p. 303. 

 On the sand which sometimes falls on the Cape Verd Islands, p. 307. On the 

 fiords of the south-eastern termination of South America, Note 347, Ou 



