Going back up the road toward the ravine at a brisk canter, he pursued the illuminating comparison between Sally and Dozier's famous Gray Peter. Of course, nothing but a downright test of speed and weight-carrying power, horse to horse, could decide which was the superior, but Andrew had ridden Gray Peter many times when he and Uncle Jasper went out to the Dozier place, and he felt that he could sum up the differences between the two beautiful animals. Sally was the smaller of the two, for instance. She could not stand more than fifteen hands, or fifteen-one at the most. Gray Peter was a full sixteen hands of strong bone and fine muscle, a big animal--almost too big for some purposes. Among these rocks, now, he would stand no chance with Sally. Gray Peter was a picture horse. When one looked at him one felt that he was a standard by which other animals should be measured. He carried his head loftily, and there was a lordly flaunt to his tail. On the other hand, Sally was rather long and low. Furthermore, her neck, which was by no means the heavy neck of the gray stallion, she was apt to carry stretched rather straight out and not curled proudly up as Gray Peter carried his. Neither did she bear her tail so proudly. Some of this, of course, was due to the difference between a mare and a stallion, but still more came from the differing natures of the two animals. In the head lay the greatest variation. The head of Gray Peter was close to perfection, light, compact, heavy of jowl; his eye at all times was filled with an intolerable brightness, a keen flame of courage and eagerness. But one could find a fault with Sally's head. In general, it was very well shaped, with the wide forehead and all the other good points which invariably go with that feature; but her face was just a trifle dished. Moreover, her eye was apt to be a bit dull. She had been a pet all her life, and, like most pets, her eye partook of the human quality. It had a conversational way of brightening and growing dull. On the whole, the head of Sally had a whimsical, inquisitive expression, and by her whole carriage she seemed to be perpetually putting her nose into other business than her own.