Böhmens Topogr., i. 339. This reference is given by Professor Pleischl.
Annalen, lxxxi. 579.
I was told, in 1864, by a chamois-hunter of Les Plans, a valley two hours above Bex, that some years before he was cutting a wood-road through the forest early in September, when, at a depth of 6 inches below the surface, he found the ground frozen hard. We visited the place together, but could find no ice. The whole ground was composed of a mass of loose round stones, with a covering of earth and moss, and the air in the interstices was peculiarly cold and dry.
Beobachtungen, &c. (see note on p. 258), 181.
Reich found the temperature of the ice to be 31·982° F., that of the air in the immediate vicinity 34·025°, and the rock, at a little distance, 32·765°.