Our four volcanic national parks exemplify four states of volcanic history. Lassen Peak is semi-active; Mount Rainier is dormant; Yellowstone is dead, and Crater Lake marks the spot through which a volcano collapsed and disappeared. Rainier's usefulness as a volcanic example, however, is lost in its supreme usefulness as a glacial exhibit. The student of glaciers who begins here with the glacier in action, and then studies the effects of glaciers upon igneous rocks among the cirques of the Sierra, and upon sedimentary rocks in the Glacier National Park, will study the masters; which, by the way, is a tip for universities contemplating summer field-classes. Upon the truncated top of Mount Rainier, nearly three miles in diameter, rise two small cinder cones which form, at the junction of their craters, the mountain's rounded snow-covered summit. It is known as Columbia Crest. As this only rises four hundred feet above the older containing crater, it is not always identified from below as the highest point. Two commanding rocky elevations of the old rim, Point Success on its southwest side, 14,150 feet, and Liberty Cap on its northwest side, 14,112 feet, appear to be, from the mountain's foot, its points of greatest altitude. Rainier's top, though covered with snow and ice, except in spots bared by internal heat, is not the source of its glaciers, although its extensive ice-fields flow into and feed several of them. The glaciers themselves, even those continuous with the summit ice, really originate about four thousand feet below the top in cirques or pockets which are principally fed with the tremendous snows of winter, and the wind sweepings and avalanches from the summit. The Pacific winds are charged heavily with moisture which descends upon Rainier in snows of great depth. Even Paradise Park is snowed under from twelve to thirty feet. There is a photograph of a ranger cabin in February which shows only a slight snow-mound with a hole in its top which locates the hidden chimney. F.E. Matthes, the geologist, tells of a snow level of fifty feet depth in Indian Henry's Hunting Ground, one of Rainier's most beautiful parks, in which the wind had sunk a crater-like hollow from the bottom of which emerged a chimney. These snows replenish the glaciers, which have a combined surface of forty-five square miles, along their entire length, in addition to making enormous accumulations in the cirques. [Illustration: SLUISKIN RIDGE AND COLUMBIA CREST] [Illustration: _From a photograph copyright by A.H. Barnes_ MOUNT RAINIER SEEN FROM TACOMA]