In the number of the Journal of Geology for June, 1910, there is an interesting article by Stephen R. Capps, Jr., on "Rock Glaciers in Alaska" which must be of especial interest to all those who have lived in Alaska or in the Yukon Territory, and more particularly to those who have lived in the city of Dawson, for these latter will at once recognize the similarity of the rockslides described and illustrated by Mr. Capps to "the Slide" on the face of Moosehide Mountain at the north end of the town of Dawson, since the Slide is one of the outstanding and ever-present features of the landscape to every resident of that northern city. The city of Dawson is situated on a swampy alluvial flat on the east bank of the Yukon River, just below the confluence of the Klondike River. About a mile to the northeast of it Moosehide Mountain rises to a height of 2,000 feet or more above the city, a spur of the mountain extending down to the Yukon River, and terminating the Dawson flat toward the north. The mountain is composed of massive basic eruptive rock or diabase largely altered to serpentine, and cut by numerous jointage planes which allow the rock to break readily into angular fragments. Over the larger portions of the surface of the mountain the rock has been weathered and decomposed to a considerable depth, and has broken down into sand or rock flour, so that the natural slopes are consequently gradual and gentle. But on the southwest side of the mountain, directly overlooking the town of Dawson, there is a steep scarped face of bare rock several hundred feet in height, at the foot of which a talus of broken rock-fragments extends outward and downward toward the river. This talus extends so far outward from the foot of the scarp, and its lower portion has such a relatively gentle slope, that it has somewhat the appearance of having broken away suddenly from the side of the mountain; and consequently the early