So, bending low in the saddle and firing as he rode, he spurred his broncho pony to frantic exertions, and dashed away up the ravine after the flying animals. Several others of the party spurred after the boy as though to join in the exciting chase; but after a short run, either because they remembered their chief's orders or because they found themselves hopelessly left behind, they returned to the train, and its slow line of march was resumed.

More than five minutes elapsed after Todd was lost to view behind a sharp bend of the ravine before Mortimer Chalmers, attracted by the sound of firing, hastened back to learn the cause of disturbance. When it was explained his face darkened, though more with anxiety than anger, and he ordered the party to go into camp where they were, there to await his return. Then calling to one of the best mounted of his assistants to see that his canteen was full of water and to follow him, the chief of the party clapped spurs to his own horse, and set off up the ravine in the direction taken by his impetuous young brother.

Until nearly sunset of the following day did the party in camp await, with ever-increasing anxiety, the return of those who had thus left them. Then their leader and his companion rode wearily back into the valley. They were haggard, covered almost beyond recognition with the dust of desert sands, and utterly exhausted, while their steeds were ready to drop with thirst and fatigue.

Mortimer Chalmers's first words announced the failure of his search, for as he entered camp he asked, "Has the boy come back?" Upon being answered in the negative, a look of utter despair settled over the man's face, though he turned away to hide it from the pitying gaze of his men.

From his companion it was learned that when, on the preceding day, they had emerged from the ravine, they found themselves on a vast plain of shifting sands, void of vegetation and dotted with great fortresslike mesas or lofty bluffs of the most vivid and varied coloring. In the distance they had descried a rider whom they believed to be Todd, but though they fired their rifles and waved sombreros to attract his attention, he failed either to see them or took no notice of their signals, and a few seconds later disappeared behind a distant butte. Hastening to that point, they found and followed his trail until it was lost in the wind-blown sands. Even then they kept on in the same general direction, firing their rifles at short intervals, until darkness compelled a halt. During the long cheerless night, without fire or food, and comforted by only a few mouthfuls of water from their canteens, they still fired occasional shots, but without receiving any answer.

At daybreak they were again in the saddle and moving in a great sweeping arc that embraced many miles of the terrible desert, back toward the river. Until reaching it they had hoped against hope that the missing lad might in some way have been led back to the point from which he had started. Now, however, there was no doubt that he was indeed lost in that fearful wilderness of sand and towering rocks.

This was the opinion of the whole party; but though it was fully shared by Mortimer Chalmers, he was off again before daylight of the following morning, accompanied by five of his most experienced men. These were to explore the desert by twos in different directions, as far as their strength and that of their animals would allow them to penetrate, though on no account were they to remain from camp longer than two days.

This expedition was as fruitless as the first, and when on the second evening the six searchers returned to camp empty-handed there was no longer a doubt but that poor Todd, lost and bewildered, had wandered beyond recovery, and met his death amid the horrors of the Painted Desert.

Although there was no longer any hope that he would ever again be seen alive, the party remained encamped at that place another day before moving on, and scouts were kept constantly posted along the edge of the plateau, whence they could command a great sweep of the interior country in case any tidings of the lost one should be miraculously wafted in that direction.

Even when the sad little camp was finally broken and the expedition resumed its melancholy march down the valley of the muddy river, these same scouts followed the edge of the bluffs, though often being obliged to make long and fatiguing detours to head precipitous cañons.