. Edinburgh New Philosophical Journal. Erratics of the xilps. 303 spread over the surface of the glacier at the moment of its dissolution, while Jura being the cite of a frontal moraine, would be a landing place for blocks, perhaps for thousands of years. (Charpentier, Essai, p. 267.) Had they been borne on floating-ice the order of distribu- tion would have been reversed; they would have been most abundant near the source of supply, that is about G k, scarcer at m o, and very scarce on Mount Jura. The Steinhoff boulder, containing 61,000 cubic feet, has been mentioned, but there are some othe
. Edinburgh New Philosophical Journal. Erratics of the xilps. 303 spread over the surface of the glacier at the moment of its dissolution, while Jura being the cite of a frontal moraine, would be a landing place for blocks, perhaps for thousands of years. (Charpentier, Essai, p. 267.) Had they been borne on floating-ice the order of distribu- tion would have been reversed; they would have been most abundant near the source of supply, that is about G k, scarcer at m o, and very scarce on Mount Jura. The Steinhoff boulder, containing 61,000 cubic feet, has been mentioned, but there are some others worthy of special notice. One of the most celebrated lies on Mount Jura at x, some hundred feet above Neuchatel (N), and being of easy access, has been visited by crowds of tourists. It is called Pierre a Bot (or toadstone), and measures 50 feet in length, 20 in breadth, and 40 in height. This great block is of granite from the north-east shoulder of Mont Blanc (u), and has been carried to a distance of 80 miles from the parent rock. I was prevented by accident from seeing the Pierre a Bot, but I saw many of the smaller size in the vicinity. At Orsieres, near Martigny, there is a granite boulder estimated to contain 100,000 cubic feet, and weighing consequently 8000 tons. It is a travelled block, for it rests on a limestone mountain, but it probably has not travelled far. ^xid At Monthey (near e) there is a remarkable group of granite blocks, amidst which I spent some hours. They lie on a sort of ter- race, about 400 feet above the bottom of the valley, and form a belt from 300 to 800 feet in breadth, according to M. Charpentier, and a mile and a half in length. One, called Pierre des Marmettes, with a summer-house on its top, is 63 feet long, 32 broad, and 30 in height. Another, named Pierre a Mourguets, is 65 feet long. There are many others whose solid contents are from 300 to 400 cubic yards. The large ones have their angles almost always sharp, shewing that they have no
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