CONTENTS. 



Zlll 



689 



712 

 713 



714 



715 

 716 



717 

 717 

 I. 718 

 f. 719 



FRIDAY, AUGUST 20. 



Page 



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



J. S. Nkwherry, M.D 719 



2. Marginal Kames. By Professor II. Carvii.l Lewis, IM.A 720 



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



4. On Fluxion-Structure in Till. By IIugu Mili.kr, A.R.S.M., F.G.S 720 



5. On the Glacial Origin of Lake Basins. Bv Alfred II. 0. Selwyn, TjL.D., 



F.R.S 721 



0. On Points of Dissimilarity and llesemblance Ijetween Acadian and Scottish 



Glacial Beds. By Ralph Rich ardsoit , F.R.S.E 722 



7. Upon thi! improhability of the theory that former Glacial IVriods in the 



Nortliern Hemisphere were due to l']ccentricity of the Earth's Orbit, and 

 to its Winter Perihi'lion 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 Discovery of new and remarliable Fossil Fishes in the Car- 



boniferous and Devonian Rocks of Ohio and Indiana. Bv Professor 



J. S. Newiierry, M.D \ 724 



MONDAY, SEPTEMBER 1. 



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



By Professor James Hall, LL.D 725 



2. On the Lamellihranchiata Fauna of the Upy lelderberg, Hamilton, 



Portage, Ohem\mg and Oatshill Groups (equiv. to the Lower, Middle 

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

 ment of the ^lonomyaria and the Development and Distribution of the 

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



3. On the ArchsEan Rocks of Great Britain. Bv Professor T. G. Bonnby, 



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 



R. First Impressions of some Pre-Cam1)rian Rocks of Canada. By Professor 

 J. F. Blaki;, M.A., F.G.S \ 728 



6. On the Southward Pending of a great Synclinal in the Taconic Range. Bv 

 Professor James I). Dana, LL.D \. 729 



7. Notice of a Geological Map of Monte Somma and Yesuviiis. Bv II. J. 



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



8. Report on the National Geological Surveys of Europe 730 



0. 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 ^Fefals in India. Bv 



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



11. What is a Mineral Vein or Lode? Bv V,. 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. W. Claypole, B.A., B.Sc. (Lond.), F.G.S '. 733 



