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In an excursion which I made the last summer, in the month of August, to the Glaciers of Chamouny, in company with Professor Pictet of Geneva, I had an opportunity of observing, on what is called the Sea of Ice, (Mer de Glace ,)a phenomenon very common, as I was told, in those high and cold regions, but which was perfectly new to me, and engaged all my attention. At the surface of a solid mass of ice, of vast thickness and extent, we discovered a pit, perfectly cylindrical, about seven inches in diameter, and more than four feet deep; quite full of water. On examining it on the inside, with a pole, J found that its sides were polished; and that its bottom was hemispherical, and well defined.

philosophical transactions of the royal society of london

III. An account of a curious phenomenon observed on the Glaciers of Chamouny; together with some occasional observations concerning the propagation of heat in fluids