The area of our present work would be very limited if we understood the word Desert in its more rigorous signification; for we should then have only to consider those desolate wildernesses which an inclement sky and a sterile soil seem to exclude for ever from man’s dominion. But, by a license which usage authorizes, we are able to attribute to this term a much more extended sense; and to call Deserts not only the sandy seas of Africa and Asia, the icy wastes of the Poles, and the inaccessible crests of the great mountain-chains; but all the regions where man has not planted his regular communities or permanent abodes; where earth has never been appropriated, tilled, and subjected to cultivation; where Nature has maintained her inviolability against the encroachments of human industry.