Midnight
But as they continued , an opening suddenly appeared , flanked on either side by huge projecting rocks . It was Nature 's great doorway in one of the mighty partitions of the house not made with hands . Through this Midnight speedily loped and ere long swept out upon a wild meadow which extended to the left farther than the eye could see , and over a mile in width . Horses were feeding here , and at once Midnight lifted up his voice in a friendly neigh of salutation , which was immediately answered by several horses in the distance . In fact , he was on the point of slowing down and swerving from the trail , but a light flick of the whip reminded him that his mistress had other business on hand which had to be attended to first , so again throwing back his ears , he dashed onward . The wild meadow crossed , they reached a wooded region where the trail ascended and wound up a steep hill . Midnight took this with a bound , and in a few minutes he was at the top , panting heavily from his vigorous exercise .