The inconceivable lapse of time covered in these titanic operations of Nature and their excessive slowness of progress rob them of much of their dramatic quality. Perhaps an inch of distance was an extraordinary advance for the Lewis Overthrust to make in any ordinary year, and doubtless there were lapses of centuries when no measurable advance was made. Yet sometimes sudden settlings, accompanied by more or less extended earthquakes, must have visibly altered local landscapes. Were it possible, by some such mental foreshortening as that by which the wizards of the screen compress a life into a minute, for imagination to hasten this progress into the compass of a few hours, how overwhelming would be the spectacle! How tremendously would loom this advancing edge, which at first we may conceive as having enormous thickness! How it must have cracked, crumbled, and fallen in frequent titanic crashes as it moved forward. It does not need the imagination of Dore to picture this advance, thus hastened in fancy, grim, relentless as death, its enormous towering head lost in eternal snows, its feet shaken by earthquakes, accumulating giant glaciers only to crush them into powder; resting, then pushing forward in slow, smashing, reverberating shoves. How the accumulations of all periods may be imagined crashing together into the depths! Silurian gastropods, strange Devonian fishes, enormous Triassic reptiles, the rich and varied shells of the Jurassic, the dinosaurs and primitive birds of Cretaceous, the little early horses of Eocene, and Miocene's camels and mastodons mingling their fossil remnants in a democracy of ruin to defy the eternal ages! It all happened, but unfortunately for a romantic conception, it did not happen with dramatic speed. Hundreds, thousands, sometimes millions of years intervened between the greater stages of progress which, with intervening lesser stages, merged into a seldom-broken quietude such as that which impresses to-day's visitor to the mountain-tops of Glacier National Park. And who can say that the landscape which to-day's visitor, with the inborn arrogance of man, looks upon as the thing which the ages have completed for his pleasure, may not merely represent a minor stage in a progress still more terrible? The grist of Creation's past milling has disappeared. The waters of heaven, collected and stored in snow-fields and glaciers to be released in seasonal torrents, have washed it all away. Not a sign remains to-day save here and there perhaps a fragment of Cretaceous coal. All has been ground to powder and carried off by flood and stream to enrich the soils and upbuild later strata in the drainage basins of the Saskatchewan, the Columbia, and the Mississippi.