632 THE JOURNAL OF GEOLOGY. 



land ; Wave-like Progress of an Epeirogenic Uplift, by Warren 

 Upham, Geological Survey of Minnesota; Zur Nereiten Frage, 

 by Dr. H. B. Geinitz, Dresden ; Genetic Classification of 

 Geology, by W J McGee, Bureau of Ethnology ; The Extent 

 and Lapse of Time Represented by Unconformities, by Pro- 

 fessor C. R. Van Hise, U. S. Geological Survey ; Restoration of 

 Clidastes (illustrated), by Professor S. W. Williston, University 

 of Kansas ; Glacial Succession in the British Isles and Northern 

 Europe, by Dr. James Geikie, Geological Survey of Scotland ; 

 Glacial Succession in Sweden, by Hjalmar Lundbohm, Geolog- 

 ical Survey of Sweden ; Glacial Succession in Switzerland, by 

 Dr. Albrecht Heim, Zurich ; Glacial Succession in Norway, by 

 Dr. Andr M. Hansen, Geological Survey of Norway ; The 

 Succession of the Glacial Deposits of Canada, by Dr. Robert 

 Bell, Canadian Geological Survey ; Glacial Succession in the 

 United States, by Dr. T. C. Chamberlin, University of Chicago ; 

 Pleistocene Climatic Changes, by Warren Upham, Geological 

 Survey of Minnesota; Evidences of the Diversity of the Older 

 Drift in North-western Illinois, by Frank Leverett, U. S. Geolog- 

 ical Survey. A paper on the General Geology of Venezuela, by 

 Dr. Adolph Ernst, was omitted on account of the illness of its 

 author ; and two papers by Dr. O. A. Derby, entitled, On the 

 General Geology of Brazil, and On the Eruptive Phenomena of 

 Brazil, were omitted because their author did not arrive until 

 after the session. Four other papers announced were not read. 



The latter part of the first session was devoted to a general 

 discussion of the question, Are there any Natural Geological 

 Divisions of World-wide Extent? The latter part of the second 

 session was devoted to the question, What are the Principles a?id 

 Criteria to be observed in the Restoration of Ancient Geographic 

 Outlines? The general question assigned for the third discussion, 

 What are the Principles and Criteria to be observed in the Correlation 

 of Glacial Formations in Opposite Hemispheres? was omitted to 

 give time for the discussion of the preceding glacial papers. 



Several of the papers read will appear in this Journal, and 

 some of the matters touched upon in the discussions may be the 



