and urged him now to cut across a gulch at which the Pacer shied. Just one misstep and down they went.

The boy escaped, but the pony lies there yet, and the wild Black Horse kept on.

This was close to old Gallego's ranch where Jo himself had cut across refreshed to push the chase. Within thirty minutes he was again scorching the Pacer's trail.

Far in the west the Carlos Hills were seen, and there Jo knew fresh men and mounts were waiting, and that way the indomitable rider tried to turn, the race, but by a sudden whim, of the inner warning born perhaps—the Pacer turned. Sharp to the north he went, and Jo, the skilful wrangler, rode and rode and yelled and tossed the dust with shots, but down on a gulch the wild black meteor streamed and Jo could only follow. Then came the hardest race of all; Jo, cruel to the Mustang, was crueller to his mount and to himself. The sun was hot, the scorching plain was dim in shimmering heat, his eyes and lips were burnt with sand and salt, and yet the chase sped on. The only chance to win would be if he could drive the Mustang