748 



SCIENCE 



[N. S. Vol. XXIX. No. 749 



between Section E and tlie Geological Society of 

 America and the Association of American Geog- 

 raphers. This was done in order that the officers 

 •of the three geologic-geographic organizations 

 may be able to plan future meetings for the read- 

 ing of papers and for field excursions, so that 

 the needs and wishes of all geologists and geog- 

 raphers may be met as fully as possible. 



On Thursday evening, December 31, Dr. Al- 

 brecht Penck, professor of geography at Berlin 

 University and Kaiser Wilhelm professor at 

 Columbia University, delivered a public address 

 on "Man, Climate and Soil," given under the 

 auspices of the Association of American Geog- 

 raphers. 



The Society of Vertebrate Paleontologists held 

 its meeting during the week, an account of which 

 has been given in Science." 



SYMPOSIUM ON COEBBIATION 



Monday, December 28 

 Pre-Gambria/n. 



C. R. Van Hise, "Principles of pre-Cambrian 

 Correlation." 



F. D. Adams, " The Basis of pre-Cambrian Cor- 

 relation." 



Discussion. 

 Early and Middle Paleozoic. 



C. D. Walcott, "Evolution of Early Paleozoic 

 Faunas in Relation to Their Environment." 



Discussion. 



A. W. Grabau, " Physical and Faimal Evolu- 

 tion of North America in the Late Ordovicic, 

 Silurie and Devonic Time." 



Discussion. 



Stuart Weller, " Correlation of Middle and 

 Upper Devonian and Mississippian Faunas of 

 North America." 



Discussion. 



Ticesday, December 29 

 Late Paleozoic. 



G. H. Girty, " Physical and Faunal Changes of 

 Pennsylvanian and Permian in North America." 



David White, "The Upper Paleozoic Floras, 

 Their Succession and Range." 



Discussion. 

 Vertebrates. 



S. W. Williston, "Environmental Relations of 

 the Early Vertebrates." 



H. F. Osborn, " Environment and Relations of 

 the Tertiary Mammalia." 



Discussion. 



= Vol. XXIX., pp. 194-198 and 376. 



Mesozoic and Tertiary. 



T. W. Stanton, " Succession and Distribution 

 of Later Mesozoic Invertebrate Faunas." 



Discussion. 



W. H. Dall, " Conditions Governing the Evolu- 

 tion and Distribution of Tertiary Faunas." 



Ralph Arnold, " Environment of the Tertiary 

 Faunas of the Pacific Coast." 



Discussion. 



Wednesday, December SO 

 Tertiary and Quaternary. 



F. H. Knowlton, " Succession and Range of 

 Mesozoic and Tertiary Floras." 

 Discussion. 



R. D. Salisbury, "Physical Geography of the 

 Pleistocene with Special Reference to Conditions 

 Bearing on Correlation." 



D. T. MacDougal, " Origination of Self-gene- 

 rating Matter, and the Influence of Aridity on its 

 Evolutionary Development." 

 Discussion. 



T. C. Chamberlin, " Diastrophism as the XJlti- 

 mate Basis of Correlation." 



The following note on the symposium on cor- 

 relation, was prepared by Mr. Willis, for the 

 secretary's report of the Baltimore meeting: 



In accordance with the announcement made in 

 Science, December 18, 1908, a symposium on cor- 

 relation was presented at the Baltimore meeting 

 under the auspices of Section E and the Gteolog- 

 ical Society of America. The object proposed 

 was a discussion of the physical and biological 

 criteria of correlation, and the influences of the 

 physical upon the biological. While most of the 

 papers presented were mainly paleontological, 

 there was generally throughout the papers and 

 the discussions an undercurrent of thought with 

 reference to this relation of cause to efi'ect. In 

 some cases decided emphasis was placed upon the 

 relation of faunas and floras to environment. 



Messrs. Van Hise and Adams presented two 

 views concerning the criteria of correlation of the 

 pre-Cambrian and the classifications which re- 

 sult from their application. Van Hise main- 

 tained the validity of the dual classification of 

 the pre-Cambrian, and, after discussing the value 

 of lithologic similarity, stratigraphic similarity 

 and unconformities for matching strata, applied 

 these methods to the North American pre-Cam- 

 brian with results which he has elsewhere pub- 

 lished recently. Adams approached the problem 

 as a part of the record of continental history and 

 based a tentative classification of the pre-Cam- 

 brian upon possible parallel events in North 



