INDEX. 



449 



Phyllodia, Piniferae, Polypodiacea?, 

 Portulacefe,Rosacece, Rubracea?, Saxi- 

 frage, Synanthereoe, Teiebinthaceee, 

 Theobroma, Tiliacea?, Umbellifera?, 

 Urticese, Yews, &c. 



Plata, Steppes of, 6. 



Plateaux, mountain, of Mexico, general 

 elevation of, 209 ; of Caxamarca, 

 Humboldt's journey over the, 390-420; 

 of Asia, 53-62 ; table of elevations, 58. 



Pleuronectes, a species of sea-fish, 260. 



Pliny's account of the eruption of Mount 

 Vesuvius, 369, 370. 



Podocarpus taxifolia, its geographical 

 distribution, 322. 



Poison, used by the Otomaks, 151, 152. 



Polygastrica, 212. 



Polypodiacese, family of the, 338. 



Polyps, natural history of the, 253. 



Pompeii buried by an eruption of Vesu- 

 vius, 369. 



Pongo River, 401, 402. 



Pontus. See Euxine. 



Popayan, plateau of, its elevation, 58. 



Popocatepetl, volcano of, 65. 



Porites elongata,260, 261. 



Porlieria hygrometrica, 401. 



Port Famine, situation and temperature 

 of, 109. 



Portulacas, 214. 



Potato plant, the native produce of New 

 Granada, 426, 427. 



Pothos, one of the vegetable forms by 

 which the aspect of Nature is princi- 

 pally determined, 227, 329 ; belongs 

 exclusively to tropical climates, 329. 



Prairies on the Missouri, 2. 



Primeval Forest. See Forest. 



Pumacena, the island of, 159. 



Pumice, volcanic origin of, 369. 



Purinarimi, perilous cataractledge of, 1 66 . 



Quad-Dra, the river, its course through 

 the Sahara, 92. 



Quadrupeds of South America, 12, 133 ; 

 of the Mississippi, 40. 



Queretaro, elevation of, 208. 



Quina Bark and Tree, notices of, 423. 



Quito, plateau of, its elevation, 58 ; the 

 first conquest of, by thelncas of Peru, 

 236 ; the table-land of, one volcanic 

 hearth, 360; one of the capitals of the 

 Incas, 396. 



Rafflesja, immense flowers of the, 231. 



Rain, general effects of, after drought in 

 the Steppes, 16, 138. 



Rattlesnake, vermes which inhabit the 

 lungs of the, 251. 



Raudal, the cataract of, 165, dangerous 

 navigation of, 166. 



Red Sea, coral reefs in the, 255. 



Reinaud, M., on the Mountaius of the 

 Moon, 115. 



Remora, the sucking fish, an agent for 

 catching turtle, 257, 258. 



" Rhodian Genius," dissertation on the 

 mysterious painting so called, 3S0-385 ; 

 the principles of vital force illustrated 

 from, by Epicharmus, 383; illustrative 

 note, 386-3S9. 



Rhopala ferruginea, 401. 



Rio de la Plata, its magnitude, 156. 



Rivers, effects of, overflowing their banks, 

 17; of South America, 156; of the 

 Caracas, the peculiar blackness of the 

 water, 160; a generic name for, usu- 

 ally adopted by those inhabiting their 

 banks, 183; the only means of travers- 

 ing the continent of South America, 

 195 ; the names of, derived from the 

 most ancient relics of languages, 236. 



Roads, remains of the great road of the 

 Incas, 393-397. 



Rocca del Palo, the highest northern 

 margin of the crater of Vesuvius, 376. 



" Rock of Patience," at the entrance of 

 the Eiver Meta, 161. 



Rocks of South America, images graven 

 in, 20, 147, 148. 



Rocky Mountains, estimated height of, 32 ; 

 extent of, 35; observations on the, 205, 

 206. 



Rome, temperature of, 108. 



Rose Tree, great size and longevity of 

 one in the Cathedral of Hildesheim, 

 275, 276. 



Rosacea?, growing in the Asiatic Steppes, 

 4, 95 ; ratio of their distribution, 321. 



Rotation Stream of the Atlantic, 120-122. 



Rotifera, wonderful revivification of the, 

 211,240, et seq. 



Rubiacese, 280, 285. 



Rupuuuri, Lake of, 187. 



Saerina, sudden appearance of, attri- 

 buted to volcanic subterranean fire, 360. 

 Sacramento River in California, 207. 

 Sahama, elevation of the, 205. 

 Sahara, the great desert of, two races of 



