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The fact here stated is as follows:—At the surface of a solid mass of ice, of vast thickness and extent, viz. the Glaciers of Montanverd, certain pits are frequently met with, about seven inches in diameter, and more than four feet deep, perfectly cylindrical, and always quite full of water: their sides are smooth, or rather polished, and their bottoms hemispherical and well defined. They are always found on the level parts of the ice, and only in the summer season, increasing gradually in depth as long as the hot weather continues, and disappearing at the return of winter, when they are completely frozen up. After calling upon those who maintain that water is a conductor of heat, to solve this phænomenon according to their principles, and pointing out to them, that as the water in these pits, being surrounded by ice, must continually be at the freezing point of temperature, it is not the general heat of the fluid that can melt the ice at the bottom of the pits, our author proceeds to give the following explanation of this singular effect.

abstracts of the papers printed in the philosophical transactions of the royal society of london

An account of a curious phænomenon observed on the glaciers of Chamouny; together with some occasional observations concerning the propagation of heat in fluids