Harry Stevens, the fourth and last of the quartette, was inclined to be a student rather than a lover of the trail and hunters' camp. His hobby seemed to lie along the study of wild animals' habits, and also the history of the ancient Indian tribes that, centuries back, were known to have inhabited the southwestern portion of our country. He had kept harping all the while upon the subject of the strange Zunis, the Hopis, and the Moquis, all of whom he knew had descended from the original cliff-dwellers. And he hoped before going back home again to find a chance to investigate some of their quaint rock dwellings high up in the cliffs bordering the wonderful Colorado Canyon.