CXXXV1 INDEX. 



as favourable to civilisation, p. 283. Cessation of earthquake movements on 

 the issue of a stream of lava, p. 203 ; Note 193. Distinguished between islands 

 adjacent to and severed from the main land, and islands distant from the 

 shore and raised from the bottom of the sea, Note 212. " Burning mud of the 

 Lelantine plains" and other volcanic phenomena and hypotheses relating to 

 them, Notes 225, 228, 230, 234. 



Struve, parallax of stars, p. 144. Local disturbances of gravitation in level parts 

 of Europe, Note 133. 



Sun, his revolution round the centre of gravity of the whole solar system, p. 134. 

 Movement of translation in space, p. 134, 135 ; Notes 101, 102. His mass and 

 volume compared to those of other fixed stars, p. 137, 138. Limits of the at- 

 mosphere of the, considered in reference to the zodiacal light, and in com- 

 parison with nebulous stars, p. 130, 131 ; note 95. Views of Anaxagoras and 

 others respecting the, note 69. 



Symond (Lieut.), depression of the Dead Sea below the level of the Mediterranean 

 determined by trigonometrical measurements, Note 353. 



Tacitus, distinguishes the influence of climate from that of race, note 433. 

 Temperature, early high, mean, and internal temp, of the globe, see Earth. 

 Local causes which raise or depress, p. 315, 316, and 316 324 ; Notes 390, 391, 

 and 393 398. Of several places on the globe, both annual and at different 

 seasons, p. 317320, 322, 325327 ; and Note 396. Decrease of, with increasing 

 elevation, p. 11, 324, 326, 327 ; Notes 6, 399. Increase of, with increasing 

 depth (in the earth), p. 162, 163; Notes 137, 138. General decrease of, with 

 increasing depth in the ocean, p. 295, 296. General uniformity and constancy 

 of, in the same part of the surface of the ocean, p. 296 ; Notes 363, 364. Zones 

 of greatest oceanic temp., p. 296, 297. Great modifications of, by currents, 

 p. 301 ; by shoals, p. 302. Depth to which the periodical variations of temp 

 descend in the earth, p. 164, 165 ; Note 139. See Thermic scale, Isothermal 

 Isotheral, and Isochimenal lines. 



Theodectes (an ancient tragic poet), on the black colour and curled hair of th 

 Ethiopians, p. 352. 



Theophylactus, speaks of Scythia as free from earthquakes, p. 191 ; Note 181. 



Thermal springs, see Springs. 



Thermic scale, of different kinds of cultivation, p. 321 ; Note 395. 



Thermometer, see Temperature. 



Thienemann, on cirrous clouds as the substratum of the Aurora, p. 182 ; Note 

 173. Absence of audible sound in Auroras, p. 185. 



Tides of the ocean, p. 298, 299. 



Tiedemann, on the brain of Negroes and Europeans, p. 351. 



Tillard (Capt.), temporary appearance of the Island of Sabrina, p. 230. 



Tournefort, zones of vegetation on Mount Ararat, and first notice of the similar 

 influence of increasing elevation and increasing latitude on vegetation, 

 p. 346, 347. 



Tralles, on the negative electricity developed in the neighbourhood of lofty cas- 

 cades, Note 41 5. 



Trogus Pompeius, his views respecting volcanic phenomena and the supposed 

 necessity of their vicinity to the sea, p. 231 ; Note 234. 



Tropical regions, advantages presented by them towards a scientific knowledge 

 of the regularity of natural laws, p. 11, 12, 338. 



Truenos of (Juanaxuato, p. 196. See Bramidos. 



