Explorations and Surveys West of the 100th Meridian. 389° 
distinct meridian lines have been determined y the Survey in 
different parts of our western country, independent of the large 
work, and the results are to be incorporated into the general 
map. 
The observations necessary for the accurate determination of 
the astronomical coérdinates of the following positions were 
completed. 
1, Santa Fé, New Mexico. 7. Georgetown, Colorado, 
2. ort Union, New Mexico, 8. Ogden, . 
3. Trinidad, Colorado, 9. Winnemucca, Nevada, 
Labran, near Cafion City, 10, Virginia City, Nevada. 
Colorado, 11 zeman, near Ft. Ellis, Mon. 
5. Colorado Springs, Col. 12, Green River, Wyoming. 
6. Hughes, Colorado. 
observations required for latitude and longitude work are by 
_ Our points of d ure to the field of operations were three 
in number Ist, Salt Lake City; 2d, Denver, Col.; 3d, Santa 
Fé, N. M. e t Lake took the field ca May 
20th. Th ies assigned to this party were to complete cer- 
tain areas hs ete atlas sheets, ieft incomplete in 1872. 
Although meeting with many physical obstacles, after an har- 
