RECORDS OF MEETINGS 



219 



H. E. Crampton, Geological Observations on the Eegion of the 



Kaiteur Falls and Mt. Eoraima, British Guiana. 

 Victor Ziegler, The Siliceous Oolites of Central Pennsylvania. 



Summary of Papers. 



The expedition described by Professor Crampton was undertaken for 

 biologic rather than geologic exploration, and a great number of most 

 interesting geological observations were made and photographs were 

 shown covering the region seldom reached by white travellers. The gen- 

 eral structure of the region was explained, and the general physiographic 

 features were described in a very instructive way. Bemarks were made 

 and questions were asked Ity Dr. Kunz and Professors Kemp and "Wood- 

 man. 



Dr. Ziegler 's paper was read by Dr. Berkey in the absence of the au- 

 thor. The discussion covered a summary of previous work on siliceous 

 oolites, their occurrence and distribution, detailed sections of the rock 

 formations and petrographic descriptions, with microphotographic illus- 

 trations and a discussion of the origin of the oolites. 



The Section then adjourned. 



Charles P. Berkey, 



Secretary. 



SECTION OF BIOLOGY. 



11 December, 1911. 



Section met at 8:15 p. m., Vice-President Frederic A. Lucas presiding. 

 The minutes of the last meeting of the Section were read and approved. 

 The following programme was then offered : 



Henry E. Crampton, Explorations in Guiana and Brazil. 

 W. K. Gregory, Notes on the Origin of Paired Limbs of Ter- 



restrial Vertebrates. 



Summary of Papers. 



Professor Crampton gave an account of a biological survey he made 

 during the past summer from Georgetown, on the coast of British Guiana, 

 to the mountains of Eoraima — the tableland that stands at the junction 

 of Brazil, Venezuela and British Guiana. The paper was illustrated with 

 lantern slides. 



Dr. Gregory said in abstract: In the problem of the origin of the 

 Tetrapod limbs, no homological value should be attached to Klaatsch's 



