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Show SUM~lARY OF THE CONTENTS. Snowy Chain (Sierra Nevada) of California. panogos 461 Laguna de Tim. 219-221 Hypsometrical profile of the Highlanu of Mexico from the city of Mexico to anta Fe . . . . . . . . 221-223 Physiognamy of Plants-p. 227 to p. 246. Universal profuse distribution of organic life on the declivities of the highe t mountains, on the ocean, and in the atmosphere. Subterranean Flora. ilicious-shelled Polygastrica in masses of polar ice. Podurellre 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 . 227-230 History of the vegetable covering of the surface of the globe. Gradual 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 landscape from deficiency of mass. The power of locomotion of individuals, 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 . Plantains or Bananas Malvacere Mimosa~ Ericere, or Heath form Cactus form Orchidere Casuarinre Needle trees Pothos and Aroidere 39* 238-239, 312-321 239-240, 321-322 240, 322-323 240, 323-324 240- 241, 324-326 241, 326-328 241-242, 328-329 242, 329-330 242, 330-345 242, 345-347 |