CONTENTS. Xlli 



FRIDA Y, A UG UST 29. 



Pa & e 



1 . Phases in the Evolution of the North American Continent. By Professor 



J. S. Newberry, M.D 719 



2. Marginal Karnes. By Professor H. Carvill Lewis, M. A 720 



3. Twelfth Report on the Erratic Blocks of England, Wales, and Ireland ... 720 



4. On Fluxion-Structure in Till. By Hugh Miller, A.R.S.M., F.G.S 720 



5. On the Glacial Origin of Lake Basins. By Alfred R. 0. Selwyn, LL.D., 

 F.R.S 721 



6. On Points of Dissimilarity and Resemhlance between Acadian and Scottish 

 Glacial Beds. By Ralph Richardson, F.R.S.E 722 



7. Upon the improbability of the theory that former Glacial Periods in the 

 Northern Hemisphere were due to Eccentricity of the Earth's Orbit, and 

 to its Winter Perihelion in the North. By W. F. Stanley, F.G.S., 

 F.R.Met.Soc 723 



8. On Ice-Age Theories. By the Rev. E. Hill, M.A., F.G.S 723 



9. On the recent Discoveiy of new and remarkable Fossil Fishes in the Car- 

 boniferous and Devonian Rocks of Ohio and Indiana. By Professor 



J. S.Newberry, M.D 724 



MONDAY, SEPTEMBER 1. 



1. On the Fossil Reticidate Sponges constituting the Family Dictyospongidse. 



By Professor James Hall, LL.D 725 



2. On the Lamellibranchiata Fauna of the Upper Helderberg, Hamilton, 

 Portage, Chemung and Catshill Groups (equivalent to the Lower, Middle 

 and Upper Devonian of Europe) ; with especial reference to the Arrange- 

 ment of the Monomyaria and the Development and Distribution of the 

 Species of the Genus Leptodesma. By Professor James Hall, LL.D... 726 



3. On the Archaean Rocks of Great Britain. By Professor T. G. Bonney, 



D.Sc, LL.D., F.R.S., Pres.G.S 727 



4. The Eozoic Rocks of North America. By T. Sterry Hunt, LL.D., 

 F.R.S 727 



5. First Impressions of some Pre-Cambrian Rocks of Canada. By Professor 



J. F. Blake, M.A., F.G.S 728 



6. On the Southward Ending of a great Synclinal in the Taconic Range. By 

 Professor James D. Dana, LL.D 729 



7. Notice of a Geological Map of Monte Somma and Vesuvius. By H. J. 

 Johnston-Lavis, M.D., F.G.S .'. 730 



8. Report on the National Geological Surveys of Europe 730 



9. The Value of detailed Geological Maps in relation to Water-supply and 



other Practical Questions. By W. Whitaker, B. A., F.G.S 731 



10. On the Mode of Occurrence of Precious Stones and Metals in India. By 



V. Ball, M.A., F.R.S 731 



11. What is a Mineral Vein or Lode ? By C. Le Neve Foster, B.A., D.Sc, 

 F.G.S .'732 



TUESDAY, SEPTEMBER 2. 



1. Plan for the Subject-Bibliography of North American Geology. By 

 G.K. Gilbert 732 



2. On some remains of Fish from the Upper Silurian Rocks of Pennsylvania. 



By Professor E. AV. Ceaypole, B.A., B.Sc. (Lond.), F.G.S 733 



