The new international encyclopaedia . and from longitude 52° to 57°E., and the more southerly Dasht-i-Lut or GreatSand Desert, extending between latitudes 29°and 32° N., and between longitudes 57° and 60°E. Their combined length is over 500 miles fromnorthwest to southeast, but they are separatedbetween the thirty-second and thirty-fourthparallels by a hilly region through which passesone of the main caravan routes between CentralPersia and Meshhed. The origin of the GreatSalt Desert is not yet clearly determined. Onetheory is that it is due to the drainage of salinestreams from the surroundin
The new international encyclopaedia . and from longitude 52° to 57°E., and the more southerly Dasht-i-Lut or GreatSand Desert, extending between latitudes 29°and 32° N., and between longitudes 57° and 60°E. Their combined length is over 500 miles fromnorthwest to southeast, but they are separatedbetween the thirty-second and thirty-fourthparallels by a hilly region through which passesone of the main caravan routes between CentralPersia and Meshhed. The origin of the GreatSalt Desert is not yet clearly determined. Onetheory is that it is due to the drainage of salinestreams from the surrounding higher lands andthe consequent deposition of a white crust orefflorescence: tlie other theory is that it is thebed of an ancient salt lake. Geologists now in-cline to the latter explanation. In 1801 a solidbed of rock salt estimated at over 600 squaremiles in area and several feet in thickness wasdiscovered in this remarkable region. Lieuten-ant Vaughn and Mr. C. E. Biddulph, whobrought to light this sea of solid rock salt. m. MEAO ^ QQHPAHT. 1 PEBSIA. 609 PEBSIA. which is probably unrivaled in the world, foundit so hard that with iron tent pegs they wereable to detach only a few chips. The Dasht-i-Lut or Great Sand Desert, whicliseparates the Province of Kliorasan from thatof Kirnian, has salt also as one of its cliief in-gredients, but it is rarely overlaid like tlie morenorthern desert with saline incrustations orbriny swamps. It gives life to a few poorshrubs, while nothing grows in the other is its prevailing feature. It is much lowerin altitude than tlie Great Salt Desert, its aver-age elevation being less than 2000 feet, while inplaces it sinks to only 500 feet above these topographic aspects have a markedetlect upon the distribution of the lines of villages and cities follow the trendof tlie mountains from east to west across NortliPersia and from northwest to southeast acrossWestern and Central Persia, because only in th
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