PRELIMINARY arrangements are announced from Moscow for the meetings of the Seventeenth International Geological Congress, which is to be held in the U.S.S.R. during the summer of 1937, the year of the twentieth anniversary of the Soviet Government. It is proposed that the first half of August should be devoted to the sessional meetings. The special topics suggested for discussion include petroleum, coal, ore-deposits, rare elements, geophysical methods, the Permian system, tectonic and geochemical problems, the relationship of magmatic rocks and ore-deposits to tectonics, and the history of geological knowledge. Three series of excursions, A9 B and C, are provisionally arranged, to take place respectively before, during and after the sessions, the whole programme extending from the beginning of July to the end of September. The A series includes excursions to the north (Pre-Cambrian and Khibina Complex); the Urals; the south (Crimea and Donets Basin); the Volga Basin; and the Caucasus. The G series are on a larger scale and cover very wide regions. They are described as petroleum and strati-graphical (main oil districts and Central Asia); Central Asia (stratigraphy, tectonics and volcanic phenomena; transcontinental (stratigraphy, tectonics and economic geology of Urals to Soviet Far East); and Turkestan-Siberia (Perm, Altai and Kuznetsk). More detailed descriptions will be given later. Meanwhile inquiries are invited and should be addressed to the Organisation Committee of the Seventeenth International Geological Congress, Moscow, 4, Kotelnicheskaya, Naberezhnaya, 17.