Next south of the Hottum glacier is the Wintum, which attains a length of over two miles, and ends with an abrupt front of ice in a cañon. Upon the southeastern slope of Mt. Shasta, at the head of a large cañon, is the Konwakitong glacier. Notwithstanding its diminutive size, its crevasses and the muddy stream it initiates indicate clearly that the ice mass continues to move. The amount of moraine material upon its borders is small, and yet, of all the glaciers about Mt. Shasta, it is the only one which has left a prominent record of important changes. The country adjacent to the west side of the Konwakitong cañon has been distinctly glaciated so as to leave no doubt that the Konwakitong glacier was once very much larger than it is at the present time. The rocks on which it moved have been deeply striated, and so abraded as to produce the smooth, rounded surfaces so common in glaciated regions. At the time of its greatest extension the glacier was 5.8 miles in length and occupied an area of at least seven square miles, being over twenty times its present size. Its limit is marked at several places by a prominent terminal moraine. The thickness of the glacier where greatest was not more than 200 feet, for several hills within the glaciated area were not covered. The striated surfaces and moraines do not extend up the slopes of those hills more than 200 feet above their bases. The thinness of the glacier is completely in harmony with the limited extent of its erosion, although the rocks are distinctly planed off, so that the low knobs and edges have regularly curved outlines. It is evident that a great thickness of rock has been removed by the ice, and that the period of ice erosion has been comparatively brief. During the lapse of time, however, there have been important climatic oscillations, embracing epochs of glacial advance and recession. None of the glaciers about Mt. Shasta, excepting the Wintum, terminate in cañons, but all of them give rise to muddy streams which flow in cañons to the mountain’s base. The cañons are purely the product of aqueous erosion, and contain numerous waterfalls, whence the streams in descending leap over the ends of old lava flows 50 to 300 feet in height.