Page:A book of the Cevennes (-1907-).djvu/39

Rh bodies. The relics of plants and animals in the same bed belong to species still existing in the neighbourhood.

Of the craters the most perfect is that of Bar, thus described by Georges Sand:—

The Lac de Bouchet is not a sheet of water filling an ancient crater, but occupies a hollow produced by the bursting of a great bubble of air in the molten lava. It is almost circular, and the ground around it is very slightly raised. Curiously enough, Roman substructures have been traced in the lake. Probably some Gallo-Roman noble had his summer villa there, overhanging the water, as at Baiæ.

This originated a tale told by the peasantry to the