Caves of Illetzkaya-Zatschita. (Murchison, Vernieul and Keyserling, _The Geology of Russia in Europe and the Ural Mountains_, 1845, vol. I., page 186.)--72 kilometers southeast from Orenburg. The caves are in the Kraoulnaïgora, a gypsum hillock 36 meters high, rising in the midst of an undulating steppe, which lies on a vast bed of rock salt. Only one of the caves contains ice. There are strong draughts in places. SIBERIA. Cave near the Fortress Kitschigina. (Fugger, _Eishöhlen_, page 66.)--A small cave, 17 kilometers east of Kajilskoi, 192 kilometers from Petropaulowsk, 605 kilometers from Tobolsk. The cave is in an open plain, and sometimes contains ice. Wrechneja Petschera. (Fugger, _Eishöhlen_, page 66.)--Near the village Birjusinska, in the neighborhood of Krasnojarsk, on the right bank of the Yenisei. Large glacière cave. Glacière Cave of Balagansk. (Fugger, _Eishöhlen_, page 66.)--A narrow cleft, 80 meters long; 192 kilometers downstream from Irkutsk on the left bank of the Angora River; at a distance of 2 kilometers from the river. Glacière Cave on the Onon River. (Fugger, _Eishöhlen_, page 66.)--A small cave; 48 kilometers from the Borsja Mountain. Mines of Siranowsk. (Fugger, _Eishöhlen_, page 126.)--In the Altai Mountains, on the Buchtorma River, an affluent of the Irtysch. Magnificent ice formations have been found in these mines. Mines of Seventui. (Fugger, _Eishöhlen_, page 126.)--Near Nertschinsk, on the Amoor River. Two of the levels contain perennial ice and hence are called _Ledenoi_. These are at a depth of about 60 meters in porous lava. The rest of the mine is in more solid rock. Glacière Cave near Lurgikan. (Fugger, _Eishöhlen_, page 67.)--Near the confluence of the Lurgikan and Schilka Rivers, in the province Nertschinsk. From 2 meters to 7 meters wide. Length 280 meters. Basins or Troughs Retaining Ice. (Dittmar, _Ueber die Eismülden im Östlichen Siberien_; Middendorff, _Zusatz_; _Bulletin de la classe physico-mathématique de l'Académie Impériale des Sciences de St. Pétersbourg_, 1853, vol. XI., pages 305-316.)--These troughs are nearly akin to gorges and gullies, but their water supply seems to come from a cause which is not usually present in gorges. Their principal observer, M. de Dittmar, thought that a cold and snowy winter would add materially to the supply of ice, but he also thought that a necessity to the existence of the ice in these troughs was an abundant water supply from a spring, whose temperature should be so high as not to freeze in winter. The cold is supplied by the winter temperatures. Some of the most important are reported-- In the Turachtach Valley. Near Kapitanskji Sasiek. In the valley of the River Belvi. In the valley of the River Antscha. In the Kintschen Valley. In the neighborhood of Kolymsk. In the Werchojanski Mountains. In the Stanowáj Mountains. KONDOOZ.