BRITISH ASSOCIATION. 



235 



We may therefore ere long, anticipate the most complete 

 publications on the above subjects. We will now recur to 

 the Sectional Meetings on Geology and Mineralogy, under 

 the auspices of the following gentlemen. 



Geology and Physical Geography. President — Mr. R. I. 

 Murchison. Vice Presidents — Sir H. T. de la Beche. 

 Revd. W. Buckland. Revd. A. Sedgwick. Mr. R. Griffith. 

 Secretaries— Mv, H. E. Strickland. G. Lloyd M. D. E. 

 W. Binney and R. Hutton. 



Chemistry f Mineralogy. President — Dr. J. Walton. Vice 

 Presidents — Marquis of Northampton. Prof. T. Graham. 

 Revd. W. V. Harcourt. Mr. M. Faraday. Dr. C. Henry. 

 Secretaries — Dr. Lyon Playfair. Mr. R. Hunt, and Mr. 

 J. Graham. 



GEOLOGICAL SECTION. 



The following are the most interesting communications 

 submitted : 



L On the Physical Structure of the Appalachian Chain, 

 as exemplifying the laws which have regulated the elevation 

 of great Mountain Chains generally, by Professors H, D. 

 Rogers and W. B. Rogers. 



The Appalachian Chain of North America is described by 

 the authors as consisting of a series of very numerous pa- 

 rallel ridges or anticlinal lines, forming a mountain belt 

 generally 100 miles in breadth and nearly 1200 miles in 

 length, stretching from the South-eastern angle of Lower 

 Canada to Northern Alabama. 



1. The strata which compose this chain are the American 

 representatives of the Silurian, Devonian, and Carbonife- 

 rous systems of Europe, united into one group of conform- 

 able deposits. The general direction of the chain being N.E. 

 and S.W,, there is a remarkable predominance of S*E. dips 



