The waters may have one or more of several sources; perhaps they come from deep springs originating in surface snows and rains; perhaps they seep in from the sea. Whatever their origin the region especially interests us as a probably early stage of phenomena whose later stages find conspicuous examples in several of our national parks. Some day, with the cooling of the region, this may become the valley of ten thousand hot springs.
But it is useful and within scientific probability to carry this conception much further. The comparison between Katmai's steaming valleys and the geyser basin of Yellowstone is especially instructive because Yellowstone's basins doubtless once were what Katmai's steaming valleys are now. The "Valley of Ten Thousand Smokes" may well be a coming geyser-field of enormous size. The explanation is simple. Bunsen's geyser theory, now generally accepted, presupposes a column of water filling the geyser vent above a deep rocky superheated chamber, in which entering water is being rapidly turned into steam. When this steam becomes plentiful enough and sufficiently compressed to overcome the weight of the water in the vent, it suddenly expands and hurls the water out. That is what makes the geyser play.
Now one difference between the Yellowstone geyser-fields and Katmai's steaming valleys is just a difference in temperature. The entire depth of earth under these valleys is heated far above boiling-point, so that it is not possible for water to remain in the vents; it turns to steam as fast as it collects and rushes out at the top in continuous flow. But when enough thousands of centuries elapse for the rocks between the surface and the deep internal pockets to cool, the water will remain in many vents as water until, at regular intervals, enough steam gathers below to hurl it out. Then these valleys will become basins of geysers and hot springs like Yellowstone's.
VIII
MOUNT RAINIER, ICY OCTOPUS
Mount Rainier National Park, West Central Washington. Area, 324 Square Miles
I
Mount Rainier, the loftiest volcano within the boundaries of the United States, one of our greatest mountains, and certainly our most imposing mountain, rises from western central Washington to an altitude of 14,408 feet above mean tide in Puget Sound. It is forty-two miles in direct line from the centre of Tacoma, and fifty-seven miles from Seattle, from both of which its glistening peak is often a prominent spectacle. With favoring atmospheric conditions it can be seen a hundred and fifty miles away.