Russia and the Ural Mountains, i. 186, sqq.
See the Papers read before the Geological Society of London, on March 9, 1842, by Sir John Herschel and Sir E. Murchison, the substance of which has been given above.
Voyages (French translation); Paris, 1788; i. 364.
In the gypsum to the NE. of Kungur, on the banks of the Iren, there is a cave containing ice. Four of its chambers have ice, in one of which a stalagmite of ice rises almost to the roof. The farthest chamber, 625 fathoms from the entrance, contains a lake of water which stretches away out of sight under the low roof. (Taschenbuch für die gesammte Mineralogie; Leonhard, 1826; B. 2, S. 425. Published as Zeitschrift für Mineralogie.)
Pallas, Voyages, i. 84.