Volcanoes, 6, 9, 14, 149, 152, 210,211, 

 221 247; author's application of 

 the term volcanic, 25 ; active volca- 

 noes, safety valves for their imme- 

 diate neighbourhood, 210; volcanic 

 eruptions, 152, 206272; mud vol- 

 canoes or salses, 221 224 ; traces of 

 volcanic action on the surface of the 

 earth and moon, 226; influence of 

 relations of height, on the occurrence 

 of eruptions, 225 231; volcanic 

 storm, 231 ; volcanic ashes, 231 ; 

 classification of volcanoes into cen- 

 tral and linear, 236, 237; theory of 

 the necessity of their proximity to 

 the sea, 242 245; geographical 

 distribution of still active volcanoes, 

 244 246; metamorphic action on 

 rocks, 246248, 



Vrolik, his anatomical investigations on 

 tho form of the pelvis, 362. 



Wagner, Rudolph, notes on the races 

 of Africa, 362. 



Walter, on the decrease of volcanic 

 activity, 211. 



Wartmann, meteors, 100. 



Weber, his anatomical investigations 

 on the form of the pelvis, 362. 



Webster, Dr., (of Harvard College, 

 U. S.,) account of the island named 

 Sabrina. See note by Translator, 

 241. 



Winds, 321 328; monsoons, 322, 323; 

 trade winds, 327, 328; law of rota- 

 tion, importance of its knowledge, 

 321323. 



Wine, on tlie temperature required for 

 its cultivation, 330; thermic table of 

 mean annual heat, 331, 332. 



Wollaston, on the limitation of the 

 atmosphere, 307. 



Wrangel, Admiral, on the brilliancy 

 of the Aurora Borealis, coincident 

 with the fall of shooting stars, 114 

 115; observations of tho Aurora, 

 191, 194, 195; wood hills of the 

 Siberian Polar Sea, 284. 



Xenophanes, of Colophon, described 

 comets as wandering light clouds, 

 85; marine fossils found in marble 

 quarries, 2(54. 



Young, Thomas, earliest observer of 

 the influence different kinds of rocks 

 exercise on the vibrations of the pen- 

 dulum, 160. 



Yul-sung, described by Chinese wri- 

 ters, as ' the realm of pleasure, 1 340. 



Zimmerman, Carl, hypsometrical re- 

 marks on the elevation of the Hima- 

 layas, 11. 



Zodiacal light, conjectures on, 69 76; 

 general account of, 126 134 ; beau- 

 tiful appearance, 126, 127; first de- 

 scribed in Childrey's Britannia Ba- 

 conica, 128, 129; probable causes, 

 130, 131; intensity in tropical cli- 

 mates, 131. 



Zones, of vegetation, on the declivities 

 of mountains, 811: of latitude, 

 their diversified vegetation, 44; of 

 the southern heavens, their magni- 

 ficence, 69; polar, 192. 



LONDON : 



MlINTSC BT T. B. HAttEISOS, ST. MARTIN'S LANK 



