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Beyond this outer belt lay the thick shades of the central forests, where the largest trees which are produced in the two hemispheres grow side by side. The plane, the catalpa, the sugar-maple, and the Virginian poplar, mingled their branches with those of the oak, the beech, and the lime.
In these, as in the forests of the Old World, destruction was perpetually going on. The ruins of vegetation were heaped upon each other; but there was no labouring hand to remove them, and their decay was not rapid enough to make room for the continual work of reproduction. Climbing-plants, grasses, and other herbs forced their way through the mass of dying trees; they crept along their bending trunks, found nourishment in their dusty cavities, and a passage beneath the lifeless bark. Thus decay gave its assistance to life, and their respective productions were mingled together. The depths of these forests were gloomy and obscure, and a thousand rivulets, undirected in their course by human industry, preserved in them a constant moisture. It was rare to meet with flowers, wild fruits, or birds, beneath their shades. The fall of a tree overthrown by age, the rushing torrent of a cataract, the lowing of the buffalo, and the howling of the wind, were the only sounds which broke the silence of nature.
To the east of the great river, the woods almost disappeared; in their stead were seen prairies of immense extent. Whether Nature in her infinite
