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Show 454 SUMMARY OF THE CONTENTS. tween the different tribes. Figures graven on the rocks show that these solitudes were once the seat of a degree of civilization which has now disappeared . . . . . . . 40-42 Scientific Elucidations and Additions-p. 43 to p. 165. The island-!'tudded Lake of Tacarigua; its relations to the neighboring mountain chains. Geological description. Progress of cultivation and of European civilization. Varieties of the sugar-cane. Cacao plantations. Great fertility of soil associated within the tropics with insalubrity of atmosphere . . . . . . 43-47 "Banks " or broken strata. General horizontality of the surface. Sub-sidences of the surface 47-49 Re:;;emblance of the distant steppe to the ocean. Naked stony crust. Tabular masses of syenite; whether prejudicial to health . 49-50 General views respecting the mountain systems of North and South America, embracing the most recent information. Chains running in a south-west and north-east direction in Brazil and in the Atlantic portion of the United States of North America. The low province of Chiquitos; small swellings of the ground constitute the division between the waters of the Guapore and Aguapehi in 15° and 17° S. lat., and between the river basins of the Orinoco and the Rio Negro in 2° and 3° N.lat. . 50-51 Continuation of the chain of the Andes north of the Isthmus of Panama (through the Aztec country, where Popocatepetl, 16,626 French, or 171720 English feet high, has very recently been again ascended by Captain Stone) in the Sierra de las Grullas and the Rocky Mountains. Excellent scientific investigations of Captain Fremont. The longest barometric levelling ever made, showing a profile or vertical f:ection of fhe earth's surface through a space of 28° of longitude. Culminating point of the route from the coast of the Atlantic to the Pacific. "South Pass," south of the Wind River Mountains. Swelling of the ground in the Great Basin. Long contested existence of the Timpanogos Lake. Coast Chain, Maritime Alps, or Sierra Nevada of California. Volcanic eruptions. Falls of the Columbia 51-59 General considerations on the contrasts shown by the spaces included between the Central Chain (the Rocky Mountains) and the diverging chains on the east and west (the Alleghanies and the Sierra Nevada of California); hypsometric characters of the low eastern space, which is only from 400 to 600 Frenc-h, or 426 to 639 English feet above the level of the sea, and of the arid, uninhabited plain 5000 or 6000 (5330 or 6400 English) feet above the same level, called the Great Basin. Sources of the Mississippi in the Lake of Istaca according to Nicollet's highly meritorious researches. Buffalo country; Gomara's assertion of buffaloes having been formerly tamed in the northern part of Mexico . 59-62 |