REPORT OF A. D. WILSON, CHIEF TOPOGRAPHER. 



LETTEE OF TBANSMITTAL. 



Office of the United States Geological and 



Geographical Survey of the Territories, 



Washington, D. C, March 24, 1879. 

 Sir : I have the honor to transmit herewith my report on the primary 

 triangulation carried on during the seasons of 1877 and 1878. 



Having completed the computations of the work of 1878 in time for 

 this report, I determined to combine the reports for the two seasons in 

 one. 



I give only a running account of the field work, time not permitting 

 me to give any detailed description of the country, but I hope circum- 

 stances will allow me to do so in the next report. 



During the field season of 1877 I was accompanied by Ernest Inger- 

 soll and William Shippen as general assistants ; Harry Yount and John 

 Stewart, packers. During the season of 1878, by A. C. Ladd, assistant ; 

 Harry Yount and Clarence Kelsey, packers, and Joe Foster as cook. 



Hoping that the accompanying report may meet with your approval, 

 I am, very respectfully, your obedient servant, 



A. D. WILSON. 



Chief Topographer. 

 Dr. F. Y. Hatden, 



United States Geologist in Charge. 



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