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cattle pony broke from the lope into a steady dog-trot. Now and then Buck's horse tossed his head high and jerked his ears quickly back and forth as if he were trying to shake off a fly. As a matter of fact he was bothered by his master's whistling. The only sound which he was accustomed to hear from the lips of his rider was a grunted curse now and then. This whistling made the mustang uneasy.

Buck himself did not know what the music meant, but it brought into his mind a thought of strong living and of glorious death. He had heard it whistled several times by Dan Barry when the latter lay delirious. It seemed to Buck, while he whistled this air, that the spirit of Dan travelled beside him, nerving him to the work which lay ahead, filling the messenger with his own wild strength.

As Buck dropped into a level tract of country he