White,] 4'^*^ [June 17, 



tion made by Mr. Howard Grant Jones, and published, under 

 the title, Notes on the Cumberland or Potomac Coal Basin," in 

 the Proceedings, Wo. 107, pages 111 to 116. 



Professor P. E. Cliase communicated a paper entitled "Plio- 

 todynamic Notes, III," including " A Series of Natural Stand- 

 ard Units for gravitating, luminous, thermal, electric and 

 chemical comparison." 



Dr. George A. Konig communicated a paper " On AlasJcaite, 

 a new member of the series of bismuth sulpho salts," as a "con- 

 tribution from the University of Pennsylvania." 



Pending nominations Nos. 934 to 936 and new nominations 

 Nos. 937 to 940 were read. 



Permission was given the Librarian to permit Professor 

 Richards, of the University of Pennsylvania, to take from the 

 library three volumes of Bouillon for the purpose ol photo- 

 graphing the engravings for his lectures. 



The Secretaries were authorized to furnish Mr. Henry Phil- 

 lips, Jr., one of the Curators, with a letter introductory to for- 

 eign correspondents of the Society. 



And the meeting was adjourned. 



JVotes on tJie Geology of West Virginia. By I. G. Wliite, Professor of 

 Natural History in the University of W. Va. 



{Bead iefore the American Philosophical Society, June 17, 1881). 



A Rectification of the Section made iy Mr. Howard Grant Jones, M.S., and 

 Published under the Title of "Notes on the Gumberland or Potomac Goal 

 Basin," in Proc. A. P. S., No. 107, %)ages 111-116.* 



The results at ■whicli Mr. Jones arrived concerning the duplication of 

 No. XI along the North Potomac river, in his paper read before this So- 

 ciety last year, were so startling, and so much at variance from my own 

 limited knowledge of the geological structure in that region, that I deter- 

 mined to investigate the question anew at the first opportunity. During 

 May of the present year, in company with some members of my class in 

 Geology at the University, we took a five days' excursion through the 

 Piedmont Keyser region, and the present paper is the result. 



As will be seen from the sequel, that part of Mr. Jones' section below 

 No. XII is erroneous. 



* Read September 17th, 1880, 



