Reference may be made also to White, Hayden's Tenth Report, 1876 (1878), 52; Peale, id., 167; Bechler, id., 372. General discussion of valley making is given by Green, Geology for students and general readers, London, 1876; Hartung, Zeitschr. Gesellsch. f. Erdkunde, Berlin, 1878, 308. In spite of the early date of some of these essays, the idea of the antecedent origin of rivers did not gain general recognition and acceptance till it was strongly stated by Powell. A CRITICAL REVIEW OF BERING'S FIRST EXPEDITION, 1725-30, TOGETHER WITH A TRANSLATION OF HIS ORIGINAL REPORT UPON IT. With a Map. BY WM. H. DALL. CONTENTS.--Introductory remarks.--Instruments and Methods.--Sources of information.--Translation of Bering's Report.--Bering's List of Geographical Positions.--An Itinerary of the Expedition.--Annotated Synopsis of the Voyage compiled from all accessible data.--Comparative Table of Geographical Positions.--Resumé of the results of the Expedition. In 1648 the tide of exploration and adventure setting eastward through Siberia, impelled the fitting out of seven small trading boats on the Kolyma river. Three of these, in charge of Simeon Deshneff, Gerasim Ankudinoff and Feodor Alexieff, respectively, reached Bering Strait. Ankudinoff's boat was wrecked on East Cape, but his party was accommodated on the others. There were hostilities with the Chukchi, the two boats were separated, and Deshneff's alone finally reached Kamchatka. Next year he constructed the trading post on the Anadyr river subsequently known as Anadyrsk. There is a tradition that in 1654 a trader named Taras Stadukin followed Deshneff's route, made a portage across the neck of East Cape, circumnavigated Kamchatka, discovered the Kurile Islands, and finally reached the Gulf of Penjina in safety. In 1711 an emissary named Peter Iliunsen Popoff was sent to East Cape by the Russians to induce the Chukchi to pay tribute. In this he failed, but brought back an account of islands beyond East Cape, and of a continent reported by the Chukchi to exist beyond these islands. Some statements which he made in regard to the people of this continent were regarded by geographers of the last century as fictitious, but with our better knowledge, they set the seal of authenticity upon Popoff's report and show that his journey was really made.