L 



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, 206 272; 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 

 the form of the pelvis, 362. 



Wagner, Rudolph, notes on the races 



of Afri< a, 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, 



Wl 823. 



Wine, on the temperature yequhed M 

 its cultivation, 330 ; thermic table ol 

 mean annual heat, 331, 332. 



W T ollaston, on the limitation of the 

 atmosphere, 307. 



Wrangel, Admiral, on the brilliancy 

 of the Aurora Borealis, coincident 

 with the fall of shooting stars, 1 14 

 115; observations of the 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, 264. 



Young, Thomas, earliest observer o. 

 the influence different kinds of rockt 

 exercise on the vibrations of the pen. 

 dulum, 160. 



Yul-sung, described by Chinese wri- 

 ters as ' the realm of pleasure,' 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 ; ;,. tensity in tropical cli- 

 mates, 131. 



Zones, of vegetation, on the declivities 

 of mountains, 8 11: of latitude 

 their diversified vegetation, 44; of 

 the southern heavens their rnatmi 

 ficeace, 69; polar, 199 



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