This was at the Thumb in the Yellowstone National Park, in the summer of 1891. I was the boy of the party. For some years I had been interested in wild life, and while in the Park I used every opportunity to study tree and animal life. I frequently climbed trees to examine the fruit they bore, to learn about the insects that were preying on them or the birds that were eating the insects. I was naturally nicknamed the Tree Climber. There was now a unanimous call for the Tree Climber to go up and get the bear down! Of course no one wants to climb a tree when it is full of bears. But at last I was persuaded to climb a tree near the one in which the bear reposed and try to rout him out. He had climbed up rapidly head foremost. He went down easily tail foremost. The instant he touched the earth there was such a yelling and slapping of coats that for a time the bear was confused as to whether he should fight or frolic. He decided to climb again. But in his confusion he took the wrong tree. He climbed up beneath me! From long experience since that time I now realize that the bear simply wanted to romp, for he was scarcely more than one year of age. The black bear is neither ferocious nor dangerous. The most fitting name I have ever heard given him is The Happy Hooligan of the Woods. He is happy-go-lucky, and taking thought of the morrow is not one of his troubles. The most surprising pranks I ever saw were those of a pet cub. During one of my rambles in the mountains of Colorado I came to the cabin of an eccentric prospector who always had some kind of a pet. On this occasion it was a black bear cub. The cub was so attached to the place that unchained he stayed or played near by all day while his master was away at work. With moccasined feet I approached the cabin quietly, and the first knowledge I had of the cub was his spying my approach from behind a tree in the rear of the cabin. He was standing erect, with his body concealed behind the tree; only a small bit of his head and an eye were visible. As I approached him he moved round, keeping the tree between us. Finally he climbed up several feet; and as I edged round he sidled about like a squirrel, and though always peeking at me, kept his body well concealed on the opposite side of the tree. On my going to the front of the cabin he descended; and when I glanced round the front corner to see him, he was peeking round the rear corner at me. As I had kept up a lively, pleasant conversation all this time, he evidently concluded that I was friendly, and, like a boy, proceeded to show off. Near by stood a barrel upright, with the top missing. Into this the bear leaped and then deliberately overturned it on the steep slope. Away down hill rolled the barrel at a lively pace with the bear inside. Thrusting out his forepaws he guided the course of the barrel and controlled its speed.