supper. Calder joined him. The marshal's mind was too full for speech, but now and again he turned a long glance of wonder upon the stallion or Black Bart. In the same silence they sat under the last light of the sunset and ate their supper. Calder, with head bent, pondered over the man of mystery and his two tamed animals. Tamed? Not one of the three was tamed, the man least of all.
He saw Dan pause from his eating to stare with wide, vacant eyes among the trees. The wolf-dog approached, looked up in his master's face, whined softly, and getting no response went back to his place and lay down, his eyes never moving from Dan. Still he stared among the trees. The gloom deepened, and he smiled faintly. He began to whistle, a low, melancholy strain so soft that it blended with the growing hush of the night. Calder listened, wholly overawed. That weird music seemed an interpretation of the vast spaces of the mountains, of the pitiless desert, of the limitless silences, and the whistler was an understanding part of the whole.
He became aware of a black shadow behind the musician. It was Satan, who rested his nose on the shoulder of the master. Without ceasing his whistling Dan raised a hand, touched the small
