. The polar and tropical worlds [microform] : a description of man and nature in the polar and equatorial regions of the globe : two volumes in one : embracing also an account of the expeditions of all the Arctic explorers from the discovery of Iceland, over one thousand years ago, to Hall's last expedition in the northern world, together with the wonderful discoveries and adventures of Agassiz, Livingstone, Wallace, and other distinguished travelers in the tropical countries. Arctic races; Tropics; Natural history; Races arctiques; Régions tropicales; Sciences naturelles; genealogy. TflK DKSK
. The polar and tropical worlds [microform] : a description of man and nature in the polar and equatorial regions of the globe : two volumes in one : embracing also an account of the expeditions of all the Arctic explorers from the discovery of Iceland, over one thousand years ago, to Hall's last expedition in the northern world, together with the wonderful discoveries and adventures of Agassiz, Livingstone, Wallace, and other distinguished travelers in the tropical countries. Arctic races; Tropics; Natural history; Races arctiques; Régions tropicales; Sciences naturelles; genealogy. TflK DKSKHT OF SAMARA. 611 as the expanao from which thoy cmorf»o. Hut tlio plains also have a difforont char- acter in various parts : somctiuics over a vast extent of country the ground is strewed with hlocks of stone or small boulders, no less fatiguing to the traveler than the loose drift sand, whicsh, particularly in its western part (most likely in consequence of the prevailing east winds), covers the dreary waste of the Sahara. Often also the plain is rent by deep chasm.;, or hollowed into vast In the former, particularly on the northern limits of the desert, the rain descending from the gulleys of the , winetimes forms streams, which are soon swallowed up by the thirsty sands, or dried by tiie burning sunbeams. The deeper basins of the Sahara are frequently of great extent, and sometimes con- tain valuable deposits of salt. Wherever perennial springs rise from the earth, or wiierever it has been possii)Io to collect water in artificial wells, green oases, often many days' journey apart from each other, break the monotony of the desert. They niiglit 1)0 compared with the charming islands tliat stud the vast solitudes of the South Sea ; but thoy do not appear, like them, as elevations over surrounding plains of sea, but as depressions, where animals and plants find a sufficient supply of water, and a protection, not less necessary, against ttie terrific of
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Keywords: ., bookcentury1800, bookdecade1870, books, booksubjectnaturalhistory
