These Pluvial conditions have not yet been correlated with the glaciations of Asia, but, by analogy with the conditions in America discussed in the next chapter, there is little doubt that they were contemporaneous with one at least of the glaciations, and probably there were two main Pluvial periods coinciding with the two Glacial periods. At Baku, on the shores of the Caspian river, Pumpelly has found old shore lines at heights of 600, 500, and 300 feet above the present level of the water. Still more interesting are the conditions found by Sven Hedin in the Kavir basin of Persia. Here there are lacustrine clays and silts referable to a Pluvial period covered by beds of almost pure salt, suggesting a rapid and complete drying up of the lake. Above this again are further silts indicating a return of Pluvial conditions. In addition to this the succession of silts and clays show that there were several minor fluctuations superposed on the main wet periods, giving ten moist phases altogether. BIBLIOGRAPHY Many of the more important references are in Russian, and for these reference is made to summaries in other languages. Sevastianov, D. P. “On the glaciation of the extreme north-east of Siberia.” _J. 12 Congr. Russ. Nat._, Moscow, 1910, No. 10, p. 491. (Russian, see _Geol. Centralblatt_, 15, p. 205.) Riesnitschanko, W. “Ancient and modern glaciers of the south-western Altai.” _Mem. Russ. Geogr. Soc._, 48, 1912, p. 357. (Russian, see _Geol. Centralblatt_, 19, p. 131.) Komarov, W. “On the Quaternary glaciation of Kamchatka—Travels in Kamchatka in 1908-9,” Vol. 1 (Russian, see _N. J. Min._, 1915, Pt. 2, P. 117). Merzbacher, G. “Zur Eiszeitfrage in der nordwestlichen Mongolei.” _Peterm. Mitt._, Gotha, 57, 1911, p. 18. Prinz, Gyula. “Die Vergletscherung des nördlichen Teiles des zentralen Tien-schan-Gebirges.” Wien, _Mitt. K. K. geogr. Gesellsch_, 52, 1909, p. 10. Obrutschev, W. A. “Geological map of Lena gold-bearing region.” St. Petersburg, 1907. [Text in Russian; see _Geol. Centralblatt_, 12, pp. 507-9.] Simotomai, H. “Die diluviale Eiszeit in Japan.” Berlin, _Zs. Ges. Erdkunde_, 1914, p. 56. Oseki, K. “Some notes on the glacial phenomena in the North Japanese Alps.” Edinburgh, _Scot. Geogr. Mag._, 31, 1915, p. 113. Lee, J. S. “Note on traces of recent ice-action in North China.” _Geol. Mag._, 59, 1922, p. 14. Burrard, S. G., and Hayden, H. H. “A sketch of the geography and geology of the Himalaya Mountains and Tibet.” Calcutta, 1907-8. Hogböm, G. “Bidrag till Isfjordsomradets kvartargeologi.” _Geol. Foren. Stockholm Forb._, 1911. (Spitsbergen; résumé in German.) Richthofen, F. Freih. von. “China.” 5 Vols., 1907-12. (Loess, see Vol. 1, p. 74 ff.) Hedin, Sven. “Some physico-geographical indications of post-Pluvial climatic changes in Persia.” _Internat. Geol. Congr._, Stockholm, 1911. “_Die Veränderung des Klimas._” CHAPTER VIII