[Illustration: Mazamas climbing the "Hog-back," above Crater Rock, and passing this rock on the descent.] The actual summit of Mount Hood is a narrow but fairly level platform, a quarter of a mile long, which is quickly seen to be part of the rim of the ancient crater. Below it, on the north, are the heads of three glaciers already mentioned, the Eliot, Coe and Ladd; and looking down upon them, the climber perceives that here the mountain has been so much cut away as to be less a slope than a series of precipices, with very limited benches which serve as gathering grounds of snow. (See pp. 55, 67 and 70.) These shelves feed the lower ice-streams with a diet of avalanches that is year by year becoming less bountiful as this front becomes more steep. Soon, indeed, geologically speaking, the present summit, undermined by the ice, must fall, and the mountain take on a new aspect, with a lower, broader top. Thus while the beautiful verse which I have quoted under the view of Mount Hood from White Salmon (p. 56) is admirable poetry, its last line is very poor geology. This, however, need not deter any present-day climbers! On the south side of the summit ridge a vastly different scene is presented. Looking down over its easy slope, one recognizes even more clearly than from the north-side view that Mount Hood is merely a wreck of its former graceful cone, a torn and disintegrating remnant, with very modest pretensions to symmetry, after all, but still a fascinating exhibit of the work of such Gargantuan forces as hew and whittle such peaks. [Illustration: Portland Ski Club on south side of Mount Hood, above Government Camp.] The crater had a diameter of about half a mile. Its north rim remains in the ridge on which our climber stands. All the rest of its circumference has been torn away, but huge fragments of its wall are seen far below, on the right and left, in "cleavers" named respectively Illumination Rock and Steel's Cliff. One of these recalls several displays of red fire on the mountain by the Mazamas. The other great abutment was christened in honor of the first president of that organization. Apart from these ridges, the entire rim is missing; but below the spectator, at what must have been the center of its circle, towers a great cone of lava, harder than the andesitic rocks and the scoriæ which compose the bulk of the mountain. This is known as Crater Rock. It is the core of the crater, formed when the molten lava filling its neck cooled and hardened. Around it the softer mass has worn down to the general grade of the south slope, which extends five miles from just below the remaining north rim at the head of the glaciers to the neighborhood of Government Camp, far down on the Cascade plateau. The grade is much less than thirty degrees. Over the slope flow down two glaciers, the Zigzag on the west, and the White River glacier on the east, of Crater Rock. [Illustration: Mount Hood Lily. (_L. Washingtonianum_)]