390 G. M. Wheeler—-Geographical and Geological Surveys. 
rassing campaign, they accomplished their work in Utah, and 
carried out the duties assigned to them in the southern part of 
the survey. Their topographical notes have been received and 
are already in the hands of the lithographer. Lieut. R. L. 
Hoxie, Corps of Engineers, had charge of this division. Lieut. 
W. L. Marshall, Corps of Engineers, had charge of the Colorado 
party. This party, assisted by the codperation from the south- 
ern portion of the Survey, has accomplished the general profile 
of the continental divide, from the latitude of Denver to the 
southern boundary of Colorado, and extended the survey lat- 
erally, so as to embrace a rectangular area limited on the east by 
the 105th meridian west from Greenwich, on the west by longi- 
tude 107 degrees, north by the latitude of Denver and south 
by the southern boundary of Colorado. A large part of the 
expedition was massed at Santa Fé, and took the field between 
the 5th and 10th of June, for the purpose of connecting with 
the labors of the expedition of 1871, and to carry the survey 
thence eastward as far as the Rio Grande, between the latitudes 
35° 80’ and 85° 20’ north, completing atlas sheets 75, 76 and 83 
respectively, and portions of 77 and 84. The several moving 
field-parties had for escorts enlisted men, from seven to ten 10 
number for each party, drawn from the military departments of 
Arizona, the Missouri and the Platte. 
While the field operations were being prosecuted, the personnel 
of the office, consisting of three draughtsmen and one computer, 
has also been kept actively engaged. Astronomical compu- 
tations have also been made during the season by Prof. Wm. A. 
Rogers, of Cambridge, Mass. The areas traversed and covered 
by the various parties will exceed 70,000 a Boke miles. This 
covers parts of Colorado, Utah, Arizona an 
entered. A large part of this territory had scarcely been trav- 
ersed by any adventurous white man, at least we have no re 
corded information to that effect. About the head waters of the 
Colorado, Chiquito and Salt Rivers a system of parks has been 
