CONTENTS. 



PREFATORY NOTE. 



No. 1. 



EXTRACT FROM THE ANNUAL REPORT OF THE SECRETARY OF WAR, 



DECEMBER, 1855. 



No. 2. 



REPORT UPON THE PROGRESS OF THE PACIFIC RAILROAD EXPLORA- 

 TIONS AND SURVEYS, NOVEMBER, 1855. 



BY CAPTAIN A. A. HUMPHREYS, 



CORPS OF TOPOORAPHICAL ENOINEERB. 



No 3. 



EXTRACT FROM THE ANNUAL REPORT OF THE SECRETARY OF WAR, 



DECEMBER, 1856. 



No. 4. 



REPORT UPON THE PROGRESS OF THE PACIFIC RAILROAD EXPLORA- 

 TIONS AND SURVEYS, NOVEMBER, 1856. 



BY CAPTAIN A. A. HUMPHREYS, 



CORPS OF TOPOr.BAPHICAIj ENGINEERS. 



No. 5. 



TABLE EXHIBITING THE COMPARATIVE LENGTHS, COST, ETC., OF THE 

 DIFFERENT ROUTES, WITH EXPLANATORY REMARKS. 



HY CAPTAIN A. A HUMPHREYS, 



(ORPS OP TOPOriRAPHICAI. KNOINEERS 



