Has the white man gained in similar ratio? Go to the cotton fields and rice lands, and learn a lesson from the instructive contrast of the gaunt and apathetic white laborer, with the sturdy, well-developed, lively black. You will then observe that these vast alluvial lands, which rank in richness and fertility with the best on the globe, must be consigned to waste by reason of insalubrity, if not cultivated by races of men who are congenial to the soil and climate. There is no white race who can cultivate these lands, and enjoy life and establish society with any duration. Malaria would forbid, if other conditions were favorable. The littoral lands of the lower tier of Slave States, which are composed of post tertiary and alluvial soils, tertiary sands and secondary chalk marls, can be tilled in safety and with economy and with gain only by the black man. Below the upper terraces and the slopes of the mountain ranges of the northern limits of these States, where we find the primary and metamorphic rocks and their debris, the white laborer cannot descend without contending with the full force of his nature, with disease, degeneration, and premature death. There are now in the States of Florida, Alabama, Mississippi, and Louisiana thirty millions of acres of arable land yet belonging to the United States, unsold and unoccupied. In all England there are but seven million acres of uncultivated land. XIII. Malaria, that curse of the Circassian race, which is the chief source of the inefficiency and mortality of their efforts of colonizations in semi-tropical climes, exerts but little influence upon the negroes, and hence they are admirably qualified for the occupation of pestilential soils. It appears from the statistics of the English that remittent and intermittent fevers, which prove the great source of inefficiency and mortality among the white troops in tropical climes, exert comparatively but little influence upon the blacks. The writer has observed the fatal effects of the pernicious fevers upon the white inhabitants of the low coasts of Georgia and South Carolina, and has seen men perish in a single night from the deadly action of the miasms, whilst the negroes were unaffected. During the English expedition up the Nile nearly all the whites were prostrated by fevers, and none of the native blacks were affected. After the French landed at Vera Cruz the yellow fever found great numbers of victims among the Europeans; but according to the report of the inspector-general, Regnaud, not one of the 600 negro soldiers and sailors from the West Indies, though hard at work there, were attacked, or rather not one of them died. There are hundreds of similar examples to illustrate the theory.