II 



SUMMARY OF THE CONTENTS. 461 



Snowy Chain (Sierra Nevada) of California. Laguna de Tim- 

 panogos 219 221 



ypsometrical profile of the Highland of Mexico from the city of 

 Mexico to Santa Fe" 221223 



Physiognomy of Plants. -p. 227 to p. 246. 



Universal profuse distribution of organic life on the declivities of the 

 highest mountains, on the ocean, and in the atmosphere. Sub- 

 terranean Flora. Silicious-shelled Polygastrica in masses of polar 

 ice. Podurellse in tubular holes in the glaciers of the Alps ; the 

 glacier flea (Desoria glacialis). Small organic creatures in the 

 dust, which falls like rain in the neighborhood of the African 

 Desert . . .. . ... . . . 227230 



History of the vegetable covering of the surface of the globe. Gra- 

 dual extension of vegetation over the bare rocky crust. Lichens, 

 mosses, and succulent plants. Causes of the present absence of 

 vegetation in particular districts 230 233 



Each zone has its peculiar character. All animal and vegetable 

 forms attached to fixed and always recurring types. Physiognomy 

 of Nature. Analysis of the general impression produced by the 

 aspect of a country or district. The several elements which make 

 up this impression ; outlines of the mountains, azure of the sky, 

 and form of the clouds : but principally determined by the vegetable 

 covering. Animal organization far less influential on the land- 

 scape from deficiency of mass. The power of locomotion of indi- 

 viduals, and frequently their small size, also contribute to lessen 

 their general effect on the landscape .... 233 236 



Enumeration of the forms of plants which principally determine the 

 physiognomy of Nature, and which decrease or increase from the 

 Equator to the Poles according to laws which have been made the 

 subject of investigation ...... 236 238 



Palms . > ' . ' ; . " '; ~-;V .: "-,7 ' "T^ ~\ 238239, 312321 



Plantains or Bananas /* ^ :> [ ; V- - : *. . . 239240,321322 

 Malvaceae'. '.* '-" ^ r f^JJ.t , V . ^i 240, 322323 



Mimosa* .^".' . : ... . ; . 240,323324 



Ericese, or Heath form .....'., . 240241,324326 



Cactus form . - j ;-;:'' i . 241,326328 



Orchidese 241242, 328329 



Casuarinse . . . ... . 242, 329330 



Needle trees . . . . . . . 242, 330345 



Pothos and Aroidese 242, 345347 



39* 



