Dick in his own way must have mourned the loss of his master when he tumbled from the saddle, but he accepted the substitute in the minute that he appeared, and yielded the same obedience to one as to the other. Brief as had been the pony’s service, he like his companions, had imbibed the fact that his one duty in life was to carry the mail pouches with the highest speed at his command, and that such service was to be performed under the guidance of the man who sat on his back.