The commencement of the journey, after leaving Valladolid _en route_ for Madrid, lay through vast tracts of sandy plains, with the far horizon bounded by brazen hills like those of Africa, and long, lofty table-lands, beneath which the Nile might well be streaming. But this is indeed, at this season at all events, a dry and barren land, where no water is. However, many broad acres of this now arid country were a few months ago smiling with waving corn. Still desolation must in a great measure be the general characteristic of the scene, with Oriental-looking mountains of bare sand, on which nothing can grow but stones, and where life is rarely seen in any form save that of the wild goat, the vulture, and the outlaw. There is little doubt that, at one of those far distant epochs with which geological science makes us familiar, the two continents joined at the spot where are now the Straits of Gibraltar, and that Spain was then continuous with Africa. In point of fact, the soil of Spain, as far as Burgos, has precisely the same characteristics as that of Africa. So on we glide, over plains and tracts of glaring sand, enlivened only here and there by a solitary peasant driving a flock of black sheep over the white expanse to places where a few miserable patches of some rank vegetation offer a meagre grazing ground for the poor animals. At long intervals there appears, seated on the plain like some low, flat island, a wretched poverty-stricken town, the burning rays of the sun reflected from its broken house-tops and off its yellow walls. In the far distance the eye may perhaps distinguish another, and after we have passed it, yet another, rising far away, isolated on the dreary waste. A large church seems to domineer over the hovels beneath, its toppling spire leaning as it were with neglect and exhaustion. Scarce a soul appears amidst these mural wildernesses. There is none of that stir, animation, and cheerfulness which generally accompany city, town, or village life in other countries. The burning sun, the sandy desert, the monotonous wilderness, have evidently left their impress on the character of the people. As we proceed rapidly over the plain, a pile of tower and battlement in ruins--a relic of heroic story, and of the glories of other days--appears before us, standing midst the solitude like the skeleton of some long-forgotten animal which had fallen there when the world was yet young, and over which now the wild birds scream and whirl, while the long, rank weeds which nearly cover it sigh to the passing breeze.