LETTER OF TRANSMITTAL. 



To His Excellency Governor Robert E. Pattison, Chair- 

 luaiL of the Board of Commissioners of the Second Geo- 

 logical Survey of Pennsylvania : 



Sir : I have the honor to present two reports on certain 

 fossil forms found in Warren. Venango, and Beaver coun- 

 ties, one by Mr. Charles E. Beecher, formerly of Warren, 

 now of Albany, N. Y., and the other by our distinguished 

 American palaeontologist, Prof. James Hall, of Albany, 

 who. when other opportunities failed, kindly volunteered 

 to study and describe the remarkable crustacean animals 

 obtained by the Hon. I. F. Mansfield, in past years, from 

 his coal mine workings at Cannelton. 



Ml-. Beecher s figures, drawn by himself, were litho- 

 graphed by Breuker & Kessler, of Philadelphia. 



Mr. Mansfield's specimens, exquisitely drawn by Mr. 

 George B. Simpson, have been reproduced in fac simile by 

 a heliotype process in Boston. 



The Secoud Geological Survey of Pennsylvania was 

 planned and has been prospcuted with a priuiary view to 

 the material interests of the Commonwealth, the practical 

 study of the rocks, tlieir structure and minei-al contents, 

 and to as perfect a descrii)tion of them as ii diligent survey 

 of facts could :iflV)r(l. with maps and sections and occasional 

 photograi)hi<; views for illustration ; and I am happy to 

 know that this conception of the proper nature of a State 

 Survey has been approved by the Board of Commissioners, 

 without reserve : and has been accepted with satisfaction 

 also by intelligent citizens of the State, whether interested 

 in the acquisition of such knowledge by possessing lands, 

 or desirous of acquiring it as preparatory to exploring or 

 mining lands. 



° (V PPP.) 



