QB15S 



W5 



Entered, for the Commonwealth of Pennsylvania, in the year 18S0, according 



to acts of Congress, 



By WILLIAM A. INGHAM, 



Secretary of the Board of Commissioners of Geological Survey, 



In the office of the Librarian of Congress, at 



Washington, D. C. 



Electrotypcd and printed by 



LANE S. HART, Stale Printer, 



Harrisburg, Pa. 



