Introduction. —To an eye trained and accustomed to observe the well defined glacial phenomena of Scotland and the more northern portions of England and Wales, the surface aspect of Cornwall and Devon does indeed present a very decided contrast, and strongly inclines the observer to doubt if there are any features in these two south-western counties which can be correctly ascribed to glacial action. The whole of the more broadly marked features which characterise a glaciated country are, or seem to be, entirely absent. There is no true boulder-clay such as covers wide-spread areas in the countries already referred to; there is nothing corresponding to their old lateral and terminal moraine heaps. Very few erratic boulders, and these of a somewhat doubtful origin. No polished and striated surfaces, or valleys filled with roches moutonnees, neither are there any true glacial clays charged with testacea of an undoubted Arctic type, such as occur plentifully in the clays in the more northern portion of our island. It would be rash, however, without careful consideration, to infer from the mere absence of these phenomena that no form of ice ever passed over the counties of Cornwall and Devon, especially as there are alleged proofs of its former presence cited by so able an observer as Mr. C. W. Peach, and also by Mr. N. Whitley, F.G.S., of Truro, who seems to have made this subject a special study. Alleged Proofs of Ice Action. —Mr. Peach1 has drawn attention to what he considers to be glacial