‘From its character of recent formation,’ says Mr. Flint, ‘from the prevalence of limestone every where, from the decomposition which it has undergone, and is constantly undergoing, from the prevalence of decomposed limestone in the soil, probably, results another general attribute of this valley――its character generally for uncommon fertility. We would not be understood to assert, that the country is every where alike fertile. It has its sterile sections. There are here, as elsewhere, infinite diversities of soil, from the richest alluvions, to the most miserable flint knobs; from the tangled cane brakes, to the poorest pine hills. There are, too, it is well known, towards the Rocky Mountains, wide belts that have a surface of sterile sands, or only covered with a sparse vegetation of weeds and coarse grass. But of the country in general, the most cursory observer must have remarked, that, compared with lands, apparently of the same character in other regions, the lands here obviously show marks of singular fertility. The most ordinary, third rate, oak lands, will bring successive crops of wheat and maize, without any manuring, and with but little care of cultivation. The pine lands of the southern regions are in many places cultivated for years, without any attempts at manuring them. The same fact is visible in the manner in which vegetation in this country resists drought. It is a proverb on the good lands, that if there be moisture enough to bring the corn to germinate, and come up, they will have a crop, if no more rain falls until the harvest. We have a thousand times observed this crop continuing to advance towards a fresh and vigorous maturity, under a pressure of drought, and a continuance of cloudless ardor of sun, that would have burned up and destroyed vegetation in the Atlantic country. ‘We have supposed this fertility to arise, either from an uncommon proportion of vegetable matter in the soil; from the saline impregnations mixed with the earth, as evidenced in the numberless licks, and springs of salt water, and the nitrous character of the soil, wherever, as in caves, or under buildings, it is sheltered from moisture; or, as we have remarked, from the general diffusion of dissolved limestone, and marly mixtures over the surface. In some way, spread by the waters, diffused through the soil, or the result of former decomposition, there is evidently much of the quickening and fertilizing power of lime mixed with the soil.’