Daubuisson[168] speaks of a _Schneegrube_, on a summit of the
_Riesengebirge_, in Silesia, 4,000 feet above the sea; but such holes
are common enough at that elevation, and I have seen two or three
remarkable instances on the Jura, within the compass of one day's walk.
Voigt[169] describes an _Eisgrube_ in the Rhoengebirge, on the
_Ringmauer_, the highest point of the _Tagstein_, where abundant ice is
found in summer under irregular masses of columnar basalt. Reich had
received from a forest-inspector an account of an ice-hole in this
neighbourhood, called _Umpfen_, which is apparently not the same as that
mentioned by Voigt.
In the Saxon Erzgebirge there are three points remarkable for their low
temperature,[170] in addition to the mines on the Sauberg mentioned
above. These are the _Heinrichssohle_, in the Stockwerk at Altenberg,
where the mean of two years' observations gives the temperature 0 deg..54 F.
lower at a depth of 400 feet than at the surface; the adit of
_Henneberg_, on the Ingelbach, near Johanngeorgenstadt, where the
temperature was again 0 deg.
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