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 civilization. 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 canons; and there are enormous plains, which in winter are white with snow, and in summer are gray 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, gray 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.

Looking down on this very scene, there stood upon the fourth of May, eighteen hundred and forty-seven, a solitary traveller. His appearance was such that he might have been the very genius or demon of the region. An observer would have found it difficult to say whether he was nearer to forty or to sixty. His face was lean and haggard, and the brown parchment-like skin was drawn tightly over the projecting bones; his long, brown hair and beard were all flecked and dashed with white; his eyes were sunken in his head, and burned with an unnatural lustre; while the hand which grasped his rifle was hardly more fleshy than that of a skeleton. As he stood, he leaned upon his weapon for support, and yet his tall figure and the massive framework of his bones suggested a wiry and vigorous constitution. His gaunt face, however, and his clothes, which hung so baggily over his shrivelled limbs, proclaimed what it was that gave him that senile and decrepit appearance. The man was dying -dying from hunger and from thirst.