So much by way of preface or introduction. These facts of structure form the data for the reconstruction of the Sussex annals during the human period. Upon them as framework all the subsequent development of the county hangs. And first let us observe how, before the advent of man upon the scene, the shire was already strictly demarcated by its natural boundaries. Along the coast, between Chichester Harbour and Brighton, stretched a long, narrow, level strip of clay and alluvium, suitable for the dwelling-place of an agricultural people. Back of this coastwise belt lay the bare rounded range of the South Downs--good grazing land for sheep, but naturally incapable of cultivation. Two rivers, however, flowed in deep valleys through the Downs, and their basins, with the outlying combes and glens, were also the predestined seats of agricultural communities. The one was the Ouse, passing through the fertile country around Lewes, and falling at last into the English Channel at Seaford, not as now at Newhaven; the other was the Cuckmere river, which has cut itself a deep glen in the chalk hills just beneath the high cliffs of Beachy Head. Beyond the Downs again, to the north, the country descended abruptly to the deep trough of the Weald, whose cold and sticky clays or porous sandstones are never of any use for purposes of tillage. Hence, as its very name tells us, the Weald has always been a wild and wood-clad region. The Romans knew it as the Silva Anderida, or forest of Pevensey; the early English as the Andredesweald. Both names are derived from a Celtic root signifying 'The Uninhabited.' Even in our own day, a large part of this tract is covered by the woodlands of Tolgate Forest, St. Leonard's Forest, and Ashdown Forest; while the remainder is only very scantily laid down in pasture-land or hop-fields, with a considerable sprinkling of copses, woods, commons, and parks. From its very nature, indeed, the Weald can never be anything else, in its greater portion, than a wild, uncultivated, and wooded region.