I examined the yellow spot closely. The knife was made of ivory. Not the kind of ivory I was acquainted with, however; it was a very much coarser grain than any ivory I had ever seen.

“That came out of a mastodon’s tusk, MacNeal,” Bonner said.

I looked at him. He was nodding, seriously. He apparently believed what he said, at any rate.

“Nice curio, Chris,” I commented, handing the thing back to him. “Heirloom, no doubt. Picked it up in one of the Indian villages, eh?”

He did not speak at once. He sat puffing, looking at the fire. Once he puckered his brows in a deep frown. I waited.

“I’ve been prospecting, as usual,” he said at length. “Down there around the headquarters of the Tukuvuk. It’s an awful place; nobody ever goes there. The Indians tell me the spirits of the dead live there. I can believe it; it’s an ideal place for imps and devils. And I was right through the heart of it. I believe I’m the first. No matter how I got there; I came up from the south last summer. You see, I had an idea there was gold in that country.

“The place where I finally settled down was in a little valley on one of the branches of the Tukuvuk between two ranges of hills running from five hundred to maybe three thousand feet high. Messy-looking place, it was; all littered up, as if the Lord had a few sizable chunks of stuff left over and just threw ’em down there to be out of the way.

“But the gold was there; I could almost smell it. I’d been getting some mighty nice color in my pan; that’s what made me decide to stay there. I got there about the middle of July, and I spent the rest of the summer sinking holes in the edge of the creek and along the benches above. What I found indicated that there was a mighty rich vein of the yellow metal thereabouts, with one end of it laying in a pocket of the stuff. If I could locate that pocket, I thought, I’d have the United States treasury backed off the map. But I wasn’t able to run the pocket down by taking bearings from my holes, because the holes didn’t line up in any particular direction.

“What with my interest in trying to get a line on that pocket, I didn’t notice that the season was getting late. But I’d brought in enough grub to last the winter through, so that didn’t matter. Just the same it was up to me to get some sort of shelter over my head, so I hustled up a one-room shack about twelve by twelve I cut from the timber on the slopes with my hand-ax. Nothing fancy, but tight enough. I put in a fireplace and cut and stacked a lot of wood outside.

“That done, winter was on me; I simply couldn’t resist the temptation to have one more try at finding the pocket that spewed the yellow metal all around there. As I said, I got no information from the holes sunk, and it was pure guesswork. I guessed I’d find my pocket on the side of a certain hill, about two hundred feet above creek level. A glacier flowed down the side of that hill through a little gulley, and my idea was that the ice ground away at the pocket and brought the metal down to the creek, and the creek scattered it. This theory was borne out to some extent by the fact that my best showings of color always came from a point a little below the conjunction of the creek and glacier.