PKOCEEDHS-^GS OF THE GEOLOGICAL SOCIETY. II 5 



may therefore conclude that one and the same agencj', namely, that 

 of ice, has done the work at each period. 



Disctrssiox. 



Dr. 8p£]s^cer referred to his own glacial experiences in xVmerica, 

 though in districts mostly north-west of Pennsylvania. In some 

 cases he had known deposits nearly 1000 feet thick. The last of 

 the till-deposits had been laid down before the beaches of the Great 

 Lakes, which might be traced for hundreds of miles. These beaches 

 have been much affected by subsequent terrestrial warpings, showing 

 that there were no highlands north of the Great Lakes affording a 

 breeding-ground for glaciers at the close of the Upper- Till episode. 

 He concluded that in studying the drift deposits, no consideration 

 had been taken of the deformation of the American continent due 

 to warping. 



Dr. HiisTDE said that as none of the pebbles referred to in the 

 paper were exhibited, it was not possible to form an opinion as to 

 the origin of the striations on them. 



Prof. Geeeist spoke of some striated pebbles which he had brought 

 from South Africa, but it had been suggested that in landslips the 

 action of one pebble sliding over another might have produced 

 these. 



Mr. MoNCKTOx failed to see how the American instance given 

 helped the evidence, such as it was, in favour of the glacial origin 

 of the Permian Breccias of Leicestershire. 



The Secretary said that no further particulars were given : he 

 had read the whole note. 



The following specimens were exhibited : — 



Specimen of Oyphaspis, exhibited by Prof. T. M'Kenuy Hughes, 

 F.It.S., F.G.S., in illustration of the paper by Miss Coignou. 



Specimens and microscopic section of Spherulites in Obsidian, ex- 

 hibited by Prank Eutley, Esq., F.G.S., in illustration of his paper. 



Bryozoa (Polyzoa) from the Eed Chalk of Hunstanton, exhibited 

 by T. Jesson, Esq., F.G.S., in illustration of the paper by G. E. 

 Yine, Esq. 



April 16, 1890. 



J. W. HiTLKE, Esq., F.E.S., Vice-President, in the Chair. 



William Hew Coltman, Esq., B.A., 13 Queen's Gate Gardens, 

 S.W. ; and Eobert S. Wyld, Esq., Jun., Memb.Inst.C.E., Oswestry, 

 Shropshire, were elected Fellows ; Dr. Dionys Stur, Vienna, a 

 Foreign Member ; and Magister Friedrich Schmidt, St. Petersburg, 

 a Foreign Correspondent of the Society. 



The List of Donations to the Library was read. 



