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Si 3 
CONTENTS OF VOLUME X. 
PARTS III, IV.—GENERAL REPORT UPON THE ZOOLOGY OF THE SEVERAL PACIFIC RAILROAD ROUTES. 
ZOOLOGICAL PORTION OF THE REPORTS, BY LIEUTENANT E. G. BECKWITH, THIRD ARTILLERY, UPON IHE 
ROUTE NEAR THE THIRTY-EIGHTH AND THIRTY-NINTH PARALLELS, SURVEYED BY CAPTAIN J. W. 
GUNNISON, AND UPON THE ROUTE NEAR THE FORTY-FIRST PARALLEL, SURVEYED BY HIMSELF. 
Nos. 2-5 OF PART VI OF THE REPORT, BY LIEUTENANT A. W. WHIPPLE, CORPS OF TOPOGRAPHICAL 
ENGINEERS, UPON THE ROUTE NEAR THE THIRTY-FIFTH PARALLEL. 
ZOOLOGICAL PORTION OF THE REPORT, BY LIEUTENANT J. G. PARKE, CORPS OF TOPOGRAPHICAL 
ENGINEERS, UPON THE ROUTE NEAR THE THIRTY-SECOND PARALLEL, FROM THE RIO GRANDE TO 
THE PIMAS VILLAGES. 185S-’4. 
PART IV OF THE REPORT, BY LIEUTENANT R. S. WILLIAMSON, CORPS OF TOPOGRAPHICAL ENGINEERS, 
UPON ROUTES IN CALIFORNIA TO CONNECT WITH ROUTES NEAR THE THIRTY-FIFTH AND THIRTY- 
SECOND PARALLELS. 
No. 4 OF PART IV OF THE REPORT, BY LIEUTENANT HENRY L. ABBOT, CORPS OF TOPOGRAPHICAL ENGI¬ 
NEERS, UPON THE ROUTES IN OREGON AND CALIFORNIA, EXPLORED BY PARTIES UNDER THE 
COMMAND OF LIEUTENANT R. S. WILLIAMSON, CORPS OF TOPOGRAPHICAL ENGINEERS, IN 1855. 
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