Vast was the quantity of material picked up and transported by these glaciers. Mountains were moved piecemeal, and ground to boulders, pebbles, and rock-flour in the moving. In addition to the material which the glacier gathered up and excavated, it also carried the wreckage brought down by landslides and the eroded matter poured upon it by streams from the heights. Most of the material which falls upon the top of the upper end of the glacier ultimately works its way to the bottom, where, with the other gathered material, it is pressed against the bottom and sides and used as a cutting or grinding tool until worn to a powder or pebbles. Train-loads of débris often accumulate upon the top of the glacier. On the lower course this often is a hundred feet or more above the surface, and as the glacier descends and shrivels, enormous quantities of this rocky débris fall off the sides and, in places, form enormous embankments; these often closely parallel long stretches of the glacier like river levees. The large remainder of the material is carried to the end of the glacier, where the melting ice unloads and releases it. This accumulation, which corresponds to the delta of a river, is the terminal moraine. For years the bulk of the ice may melt away at about the same place; this accumulates an enormous amount of débris; an advance of the ice may plough through this and repile it, or the retreat of the ice or a changed direction of its flow may pile the débris elsewhere and over wide areas. Many of these terminal moraines are an array of broken embankments, small basin-like holes and smooth, level spaces. The débris of these moraines embraces rock-flour, gravel, pebbles, a few angular rock-masses, and enormous quantities of many-sized boulders,--rocks rounded by the grind of the glacial mill. Strange freight, of unknown age, these creeping ice rivers bring down. One season the frozen carcass of a mountain sheep was taken from the ice at the end of the Arapahoe Glacier. If this sheep fell into a crevasse at the upper end of the glacier, its carcass probably had been in the ice for more than a century. Human victims, too, have been strangely handled by glaciers. It appears that in 1820 Dr. Hamil and a party of climbers were struck by a snowslide on the slope of Mont Blanc. One escaped with his life, while the others were swept down into a crevasse and buried so deeply in the snow and ice that their bodies could not be recovered. Scientists said that at the rate the glacier was moving it would give up its dead after forty years. Far down the mountain forty-one years afterward, the ice gave up its victims. A writer has founded on this incident an interesting story, in which the bodies are recovered in an excellent state of preservation, and an old woman with sunken cheeks and gray hair clasps the youthful body of her lover of long ago, the guide.