He states that ice is found in the
mines of Nordmarck, three leagues from Philipstadt in Wermeland, a
province of Sweden: these mines are merely numerous shafts sunk in the
earth, reaching to the bottom of the vein of ore, so that they are fully
exposed to the light, and yet the walls of the shafts become covered
with ice at the end of winter, which remains there till the middle of
September. Jars believed that, if it were not for the heat caused by
blasting, and by the presence of the workmen, the ice would be
perennial. Humboldt[166] speaks of the ice in these mines and on the
Sauberg. Reich states that ice is found in the mill-stone quarry of
Nieder-Mendig, quoting Karsten's _Archiv fuer Bergbau_.[167] The ice is
found in the hottest days of summer, although the interior of the quarry
is connected with the outer air by many side shafts. The porous nature
of the stone is assigned as the cause of the phenomenon. Daubeny (On
Volcanoes) describes the remarkable basaltic deposits at
Niedermennig--as he spells it--but says nothing of the existence of ice.
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