SOME unpoetic old frontiersman first called the place a trapper’s “hole,”—an ugly, misleading name for this wondrous mountain valley, lying up there on the western slopes of the Continental Divide next to the Yellowstone country, almost surrounded by a rim of craggy, snow-streaked mountains, and grassy, wooded hills, out of whose picturesque canyons streams came leaping and sparkling to make a silvery network over the valley floor and to combine at last into the beautiful river that winds along the base of the western hills. This web of streams may still be traced as one gets a kind of bird’s-eye view of it from the hills above; but irrigation has given a conventional aspect to the valley floor by checkering it with farms, dotting it with regularly laid out towns and cities, and marking it with surveyors’ roads and canals.{2}