Well, the beavers liked the place, and piled up their dam, while the water went farther and farther back across the swamp.

Finally, the beavers either died off or something drove them out.

It was probably after that that the dam broke down and the water ran off.

Then the snowslide cut off the creek, and as the hollow dried out the willows spread across it." Weston could find no fault with this train of reasoning, which made comparatively plain Grenfell's long and unsuccessful search.
"Yes," he admitted, "it's logical, and I think it's correct.

I believe, from what Grenfell once said, that he crossed the range to the east of us, not far away, some years ago with another man, and he must have noticed this valley.