METHOD OF COMPILING THE MAP. 103 
with the position of those points as already adopted, and this moves his position for the latter 
point 14’ to the east. His position for his camp of September 9, 1845, on the Canadian, is the 
same as on Lieutenant Whipple's map. His route in reducing had thus to be shortened 14’ in 
longitude between that point and the Cimarron crossing of the Canadian. 
Lieutenant Abert’s longitude of the point where he left the Canadian (as nearly as I can 
recognise it on Whipple’s map) seems to correspond, in position, with Lieutenant Whipple’s, 
as does also the crossing of the north fork of the Washita. They have therefore been adopted. 
Lieutenant Abert’s positions are retained as far east as Old Fort Edwards, at the mouth of 
Little river. 
Lieutenant Abert’s map of explorations in New Mexico, in 1846, has been reduced to the 
general map, by making the points of his trail correspond, in position, with those of the other 
explorers, reduced, as already stated, wherever they intersect. 
In Mr. R. H. Kern’s reconnaissance of the Pecos he assumed the longitude of Anton Chico 
to be 105° 25’. According to Lieutenant Whipple it is 105° 09’, being 16’ to the east of Mr. 
Kern's position, whose work has therefore been moved 16’ to the east for that portion of the 
Pecos below Anton Chico. 
The boundary of the country lying between the upper part of the Pecos and the Rio Grande 
having now been determined, the map of Lieutenant I. N. Moore was used to fill in the inter- 
vening space, his positions being made to conform to those previously adopted. 
The map of the survey of the boundary of the Creek country by Sitgreaves and Woodruff, and 
of the north fork of the Canadian, &c., has been reduced to the general map without any change. 
Major Long's map of his expedition to the Rocky mountains has been used for his route 
between the Arkansas and Canadian rivers. The point where he left the Arkansas I believe 
to be about halfway between the mouths of the Apishpa and Timpas creeks, in longitude 105? 
2'l', by the general map; on his map it is in longitude 103° 46'. We have therefore moved 
his trail between this point and the Canadian 19'to the east, which makes the mouth of the 
branch of the Canadian down which he travelled correspond to the mouth of one represented 
on Lieutenant Abert's map. The route of Major Bell (who conducted the detachment of 
Major Long's expedition along the Arkansas) is used to put in that stream between Walnut 
creek and Fort Gibson. 
The map of the reconnaissance of Captain Boone between the Arkansas and Canadian rivers 
has been reduced to re with m positions already determined wherever they are 
common to his routes. 
The reconnaissance of Lieutenant PUPA between Fort Gibson and the Santa Fé road to 
Independence, of Major Merrill between Fort Belknap and Council Grove, and of Captain 
Pope from the Cimarron to the Arkansas, have been reduced to our map, by making the 
points common to the explorations previously reduced to conform therewith. 
As before stated, the longitudes of all points along the west boundary of Missouri are deter- 
mined by reference to the land surveys, the longitude of them being determined by that of 
St. Louis. The longitude of Westport, the starting point of Captain Frémont’s first two expe- 
ditions, is thus determined to be 94° 37’, instead of 94° 22’, as adopted by him; that of Fort 
Leavenworth to be 94? 58', instead of 94? 44', as determined by Mr. Nicollect, and adopted 
by Major Emory and Captain Stansbury. Captain Frémont, in a note preceding the list of 
astronomical positions in his report of his second expedition, (page 321,) says: ‘‘ The course ot 
the ensuing expedition will intersect the line established by our previous operations at various 
