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... ntent at http://about.jstor.org/participate--jstor/individuals/early-journal--content. JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact support@jstor.org. SCIENCE. SCIENCE. ing nearly to the Rockies in the region mentioned. The drift of the northeastern ice sheet overlapped that coming from the mountains, just south of the 49th parallel. This relation of the two bodies of drift shows that the continental ice sheet reached its most advanced position after the valley glaciers from the west had retreated. There is no evidence, however, that the interval between the deposition of the two bodies of drift was considerable. The Sweet Grass Hills, just south of the 49th-parallel, and thirty miles back from the edge of the ice sheet, were nunataks. The slope of the surface of the continental ice sheet between its edge and the Sweet Grass Hills is estimated to have been about 50 feet per mile. A long narrow lake existed in front of the Keewatin ice sheet, the standing water resulting from the obstruction of drainage by the ice. The present drainage of the region is in many respects notably different from that which obtained in pre-glacial times. Messrs. George Garrey and Eliot Blackwelder, partly in company with the writer and partly alone, made a number of determinations with reference to Pleistocene glaciation west of. the Rockies and east of the Cascades. The boundaries of the Okanogan or Coulee City (Wash.) ice lobe, south and east of the Columbia River, were traced out. This ice lobe had previously been made known by Russell, and its general limits indicated. Mlessrs. Garrey and Blackwelder also determined the existence of a great glacier down the valley of the Columbia just west of the 118th meridian. This glacier descended the valley of the Columbia to the point where the Spokane River comes in. The eastern margin of this glacier looped northward around Huckleberry Mountain (Tp. 32, R. 38 E.), and to the east of this point another glacier descended the valley of the Colville River. These two glaciers were, therefore, separated only at their southern ends, becoming continuous to the north. The eastern margin of the Colville glacier, which descended to Springdale, probably connects around Old Dominion Mountain with the ice which descended the Pend d'Oreille valley. The ice of this valley descended southward to a point three miles southwest of ing nearly to the Rockies in the region mentioned. The drift of the northeastern ice sheet overlapped that coming from the mountains, just south of the 49th parallel. This relation of the two bodies of drift shows that the continental ice sheet reached its most advanced position after the valley glaciers from the west had retreated. There is no evidence, however, that the interval between the deposition of the two bodies of drift was considerable. The Sweet Grass Hills, just south of the 49th-parallel, and thirty miles back from the edge of the ice sheet, were nunataks. The slope of the surface of the continental ice sheet between its edge and the Sweet Grass Hills is estimated to have been about 50 feet per mile. A long narrow lake existed in front of the Keewatin ice sheet, the standing water resulting from the obstruction of drainage by the ice. The present drainage of the region is in many respects notably different from that which obtained in pre-glacial times. Messrs. George Garrey and Eliot Blackwelder, partly in company with the writer and partly alone, made a number of determinations with reference to Pleistocene glaciation west of. the Rockies and east of the Cascades. The boundaries of the Okanogan or Coulee City (Wash.) ice lobe, south and east of the Columbia River, were traced out. This ice lobe had previously been made known by Russell, and its general limits indicated. Mlessrs. Garrey and Blackwelder also determined the existence of a great glacier down the valley of the Columbia just west of the 118th meridian. This glacier descended the valley of the Columbia to the point where the Spokane River comes in. The eastern margin of this glacier looped northward around Huckleberry Mountain (Tp. 32, R. 38 E.), and to the east of this point another glacier descended the valley of the Colville River. These two glaciers were, therefore, separated only at their southern ends, becoming continuous to the north. The eastern margin of the Colville glacier, which descended to Springdale, probably connects around Old Dominion Mountain with the ice which descended the Pend d'Oreille valley. The ice of this valley descended southward to a point three miles southwest of 355 355 * 'Ein fossiles Kamel aus Siidrufsland, nebst Bemerkungen uber die Heimat der Kamele,' Sonderabdr. aus dem Globus, Bd. LXXX., Nr. 12, pp. 188-189. t' Fossil Remains of Lake Callabona,' Part I.