

PROFESSIONAL PAPERS OF THE ENGINEER DEPARTMENT, U. S. ARMY. 



No. IS. 



REPORT 



OF THE 



GEOLOGICAL EXPLORATION OF THE FORTIETH PARALLEL, 



MADE 



BY ORDKR OF THE SECRETARY OF WAR ACCORDINfJ TO ACTS OP 

 CONGRESS OF MARCH 2, 1807, AND MARCH :!, lf<5<J, 



lINDEn TIIR DIRECTION OF 



BRIG. AND BVT: MAJOR GENERAL A. A. HUMPHREYS. 



CIIIKF OK KNGINKKRS 

 BY 



CLARENCE KING, 



V. S. OROLOCilST. 



I-II 



