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M. Arcelin remarks that there are in England two exceptional geological landmarks, the Forest Bed representing the last Pliocene formations, and the River Gravels, which are the most ancient Quaternary deposits. Between the two, we find the Boulder Clay of Glacial origin.

They bear, in addition to the mark of their owner, notches of different shapes commemorating his exploits in battle or in hunting. At Solutre, MM. Ducrost and Arcelin noticed fragments of elephants' tusks, calcareous plaques, and some sandstone disks from the Trias, with notches and equidistant lines evidently having a similar purpose. Whistle from the Massenat Collection.

M. Arcelin mentions a similar deposit on the summit of the Jebel Kalabshee, near Esneh in Egypt, and a few years ago another was found in Palestine, near the ancient Berytus, containing great numbers of hatchets, saws, scrapers, and all the implements characteristic of the Stone age; whilst amongst them lay the blocks from which they had been cut.

These objects, says M. Arcelin, are always found either beneath modern deposits or at the surface of the upper plateaux at the highest point to which the river rises; nothing has, however, been found in the alluvial deposits of the Nile, in spite of the most persevering search.