472 INDEX. 



difference, 30, 109 ; the southern hemisphere cooler and moister 



than the northern, 121. 

 Climatic effects of extensive forests, 112. 



Coelebogyne, produces perfect seeds without any trace of pollen hav- 

 ing been discovered, 260. 

 Condor. Discussion of the height in the atmosphere to -which the 



condor ascends, 252. 

 Coniferse, or needle-trees, 242, 330. 

 Coral reefs, classified by Darwin, 268; his hypothesis of the origin 



and growth of coral reefs, 277. 

 Correo que nada, the "swimming post" in the upper waters of the 



Amazons river, 420. 



Curare, plant from which the poison is obtained, 165. 

 Current. Great revolving current of the Atlantic Ocean discussed, 



134. 



Dogs. European dogs have become wild in South America, and live 

 in troops in the Pampas, 98 ; native Peruvian dogs, 99 ; Tschudi's 

 remarks on the indigenous races of dogs in America, 101. 



Dragon-tree of Orotava, 236, 283. 



Esquimaux, instances recorded of their having been carried across 

 the Atlantic to the shores of Europe, 136. 



Ferns, 244, 354. 



Figured rocks, i. e. figures engraven on rocks in an extensive district 

 of South America, 160. 



Fresh water springs in the ocean near Cuba, 187. 



Fournel, recent contributions to the physical geography of Northern 

 Africa, 104. 



Fremont, Captain, importance of his geographical memoirs on our 

 knowledge of the geography of North America, 50 ; and gene- 

 rally in Note ( 6 ), also 219. 



Geographical distribution of plants, laws of the, 295. 



Gobi, the plateau of, 75, 78. 



Graminese, 243, 351. 



Guaranis, a tribe inhabiting the seacoast and rivers near the mouth 

 of the Orinoco, 147. 



Granite, leaden-colored rocks of, in the Orinoco, 154. 



Great basin, the elevated plain so called, between the Rocky Mount- 

 ains and the Sierra Nevada of California, 55 ; forms an inland 

 closed river basin, 219. 



Gymnotus, description of its capture in South America by means of 

 horses, 39. 



Heat in plants developed during inflorescence, 346. 



Heaths, 240, 324. 



Himalaya, one of the four parallel mountain chains of Central Asia, 88. 



Hiongnu, 94. 



Hooker, Dr. J., recent determination of the elevation of the Kinchin- 



