In the central portion of the great North American Continent there lies an arid and repulsive desert, which for many a long year served as a barrier against the advance of civilisation. From the Sierra Nevada to Nebraska, and from the Yellowstone River in the north to the Colorado upon the south, is a region of desolation and silence. Nor is Nature always in one mood throughout this grim district. It comprises snow-capped and lofty mountains, and dark and gloomy valleys. There are swift-flowing rivers which dash through jagged cañons; and there are enormous plains, which in winter are white with snow, and in summer are grey with the saline alkali dust. They all preserve, however, the common characteristics of barrenness, inhospitality, and misery.

There are no inhabitants of this land of despair. A band of Pawnees or of Blackfeet may occasionally traverse it in order to reach other hunting-grounds, but the hardiest of the braves are glad to lose sight of those awesome plains, and to find themselves once more upon their prairies. The coyote skulks among the scrub, the buzzard flaps heavily through the air, and the clumsy grizzly bear lumbers through the dark ravines, and picks up such sustenance as it can amongst the rocks. These are the sole dwellers in the wilderness.

In the whole world there can be no more dreary view than that from the northern slope of the Sierra Blanco. As far as the eye can reach stretches the great flat plain-land, all dusted over with patches of alkali, and intersected by clumps of the dwarfish chaparral bushes. On the extreme verge of the horizon lie a long chain of mountain peaks, with their rugged summits flecked with snow. In this great stretch of country there is no sign of life, nor of anything appertaining to life. There is no bird in the steel-blue heaven, no movement upon the dull, grey earth—above all, there is absolute silence. Listen as one may, there is no shadow of a sound in all that mighty wilderness; nothing but silence—complete and heart-subduing silence.

It has been said there is nothing appertaining to life upon the broad plain. That is hardly true. Looking down from the Sierra Blanco, one sees a pathway traced out across the desert, which winds away and is lost in the extreme distance. It is rutted with wheels and trodden down by the feet of many adventurers. Here and there there are scattered white objects which glisten in the sun, and stand out against the dull deposit of alkali. Approach, and examine them! They are bones: some large and coarse, others smaller and more delicate. The former have belonged to oxen, and the latter to men. For fifteen hundred miles one may trace this ghastly caravan route by these scattered remains of those who had fallen by the wayside.