CONTENTS OF VOLUME X. 



PABTS m, 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 THE 

 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. 1853-'4. 



PART IV OF THE REPORT, BY LIEUTENANT R. S. W^ILLIAMSON, 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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