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POPULAR SCIENCE REVIEW. 
reached the Jura, and the Rhine glacier swept over the plains 
of Bavaria, when there were glaciers in the Vosges and in the 
Black Forest ; then I believe glaciers swept across the upper 
basaltic platforms which are now high above the valleys of Mont 
Dore. When the great Alpine glaciers passed away, so melted 
also the glaciers of Mont Dore, and the mammoth and hairy 
rhinoceros pastured in the vales, with lagomys and spermo- 
philus on the mountains. There may have been short glaciers 
among the hills, extending only a little way down the valleys, 
as the transported rocks of Tranteine seem to testify. But the 
relics of such retiring glaciers are difficult to recognise ; and so 
masked is the evidence of glacial action by the wear and tear 
of long ages of atmospheric actions, the wash of many stream?,, 
and possibly by later volcanic outbursts, that I am convinced 
much yet remains to be explored before we shall read aright tho 
history of the Glaciers of Auvergne. 
EXPLANATION OF PLATE I. 
Sketch-map of the volcanic district of the Auvergne. 
