"But to get back. Down at the lower end of the valley I got winded and gave over. I began to speculate, for when my wind left me my dander got hotter and hotter, and I knew I'd never know peace of mind till I dined on roasted mammoth-foot. And I knew, also, that that stood for SKOOKUM MAMOOK PUKAPUK--excuse Chinook, I mean there was a big fight coming. Now the mouth of my valley was very narrow, and the walls steep. High up on one side was one of those big pivot rocks, or balancing rocks, as some call them, weighing all of a couple of hundred tons. Just the thing. I hit back for camp, keeping an eye open so the bull couldn't slip past, and got my ammunition. It wasn't worth anything with the rifle smashed; so I opened the shells, planted the powder under the rock, and touched it off with slow fuse. Wasn't much of a charge, but the old boulder tilted up lazily and dropped down into place, with just space enough to let the creek drain nicely. Now I had him." "But how did you have him?" I queried. "Who ever heard of a man killing a mammoth with a hand-axe? And, for that matter, with anything else?" "O man, have I not told you I was mad?" Nimrod replied, with a slight manifestation of sensitiveness. "Mad clean through, what of Klooch and the gun. Also, was I not a hunter? And was this not new and most unusual game? A hand-axe? Pish! I did not need it. Listen, and you shall hear of a hunt, such as might have happened in the youth of the world when cavemen rounded up the kill with hand-axe of stone. Such would have served me as well. Now is it not a fact that man can outwalk the dog or horse? That he can wear them out with the intelligence of his endurance?" I nodded. "Well?" The light broke in on me, and I bade him continue. "My valley was perhaps five miles around. The mouth was closed. There was no way to get out. A timid beast was that bull mammoth, and I had him at my mercy. I got on his heels again hollered like a fiend, pelted him with cobbles, and raced him around the valley three times before I knocked off for supper. Don't you see? A race-course! A man and a mammoth! A hippodrome, with sun, moon, and stars to referee!