310 ANNUAL KECOIID OF SCIENCE AND INDUSTRY. 



Tlie first session was devoted to Structural and Dynamical 

 Geology, and included, among others, papers by Daubree and 

 by Alphonse Favre, both giving results of experiments rela- 

 tive to the origin of fractures and foldings of the earth's 

 crust. These were followed by Lory, on the Structure of 

 the Alps ; by De Chancourtois, on the Co-ordination of the 

 Lines of Faults and Veins; and by De Lap parent on the 

 Foldings of the Chalk as Disclosed by the Examinations for 

 the Tunnel beneath the Strait of Dover. 



In the second session James Hall discussed the History of 

 the Rise and Progress of the Nomenclature of the Paleozoic 

 Rocks in North America, and of the various Geological Maps; 

 while Renevier, De Chancourtois, and Hugenin submitted 

 their plans for the Use of Colors and Signs in Mapping. 

 Stephanesco and Rutot discussed the Value of Geological 

 Subdivisions and the Bases of a Uniform Geological Nomen- 

 clature for all Countries ; while Vilanova set forth his plan 

 of a General Dictionary of Geology. 



In the third session T. Sterry Hunt presented a memoir on 

 the Upper and Lower Limits of the Cambrian Series, and was 

 followed by Barrande on the same subject. Von Moeller 

 then discussed the Constitution of the Carboniferous Series 

 in Different Regions of Europe, and its Relations to Devonian 

 and Permian ; and was succeeded by Lesley on the same 

 questions as presented in Pennsylvania, and by Velain on 

 the Relations of the Trias and Lias in France. 



In the fourth session Cope discussed the Relations of the 

 Horizons of Fossil Vertebrates in Europe and America, and 

 was followed by Albert Gaudry and by Matheron on the 

 same subject. De Mortillet presented his views on the 

 Quaternary Formations, and Alphonse Favre discussed the 

 Hypothesis of Former Glacial Periods. Van der Broeck and 

 Buvignier considered the Agency of Meteoric Phenomena in 

 the Alterations of Rocks ; and W.P.Blake presented and de- 

 scribed a Geological Map of the United States of America. 

 The Origin of Volcanoes was then considered by Virlet 

 d'Aoust, after which the Local Admixtures of Organic Re- 

 mains of Different Horizons, giving rise to what have been 

 called Colonies, alike in Jurassic and Devonian Strata, were 

 discussed by ChofVat, Renevier, and Gosselet. 



In the fifth session Des Cloizeaux and Michel Levy discuss- 



