Camp No. 
Camp No. 
Camp No. 
Camp No. 
Camp No. 
Camp No. 
Camp No. 
Camp No. 
Camp No. 
Camp No. 
Camp No. 
Camp No. 
Camp No. 
Camp No. 
. Camp No. 
Camp No. 
-Camp No. 
Camp No. 
Camp No. 
Camp No. 
METHOD OF COMPILING THE MAP. 
104, Pueblo creek, to Camp No. 104, Aztec Pass. 
105, Pueblo creek, to Camp No. 105, Williams' river. 
106, Cafion creek, to Camp No. 106, Williams' river. 
107, Cafion creek, to Camp No. 107, Williams’ river. 
108, Cafion creek, to Camp No. 108, Williams’ river. 
109, Cafion creek, to Camp No. 109, White Cliff creek. 
113, mouth of Cafion creek, to Camp No. 113, Williams’ river. 
114, Big Sandy creek, to Camp No. 
115, Big Sandy creek, to Camp No. 
116, Big Sandy creek, to Camp No. 
117, Big Sandy creek, to Camp No. 
118, Big Sandy creek, to Camp No. 
119, Big Sandy creek, to Camp No. 
120, Big Sandy creek, to Camp No. 
121, Rio Santa Maria, to Camp No. 
122, Rio Santa Maria, to Camp No. 
123, Rio Santa Maria, to Camp No. 
124, Rio Santa Maria, to Camp No. 
125, Rio Santa Maria, to Camp: No. 
126, Rio Santa Maria, to Camp No. 
114, Williams’ 
115, Williams’ 
116, Williams 
117, Williams’ 
118, Williams’ 
119, Williams’ 
120, Williams’ 
121, Williams’ 
122, Williams’ 
123, Williams’ 
124, Williams’ 
125, Williams’ 
126, Williams’ 
river. 
river. 
river. 
river. 
river. 
river. 
river. 
river. 
river, 
river, 
river, 
river. 
river. 
99 
Lieutenant Simpson, in his map of the route of the expedition to the Navajo country in - 
1849, bases all his astronomical determinations upon the longitude of Santa Fé, determined by 
Major Emory in 1846, viz: 106° 02’ 30". In this way he determined the longitude of his 
station, ‘‘two miles northwest from the mouth of the Caiion de Chelly," (his most western 
station,) to be 109° 42’ 30"; Cañon Cito Bonito, (near Fort Defiance,) to be 109° 15' 30”; 
Zuiii to be 108° 56’. TPE A to Lieutenant Whipple, Zuñi is 13’ too far west. Lieutenant 
Whipple’s revised position for Fort Defiance is in longitude 108° 59’, making Lieutenant 
Simpson’s position for it 16’ 30" too far west; but this determination of Lieutenant Whipple 
-depends upon a side reconnaissance, and ا‎ be considered as accurate as the main line of 
his route. I have, however, considered the determinations of Lieutenant Whipple, where 
they have tested Lieutenant Simpson's work, as sufficient authority for moving the latter’s 
position of. the most. „western part of Cañon de Chelly 13’ to the east, thus placing it in 
longitude 109° 02’. Lieutenant Simpson’s trail was reduced between this assumed position 
and Santa Fé, adopting Major Emorry’s longitude for the latter. The error in position which 
Lieutenant Simpson’s work shows, according to Lieutenant Whipple’s, is not greater than is 
liable to the method employed, viz: chronometric differences by chronometers transported over 
rough and mountainous country. 
Lieutenant Simpson’s survey along the Canadian in 1849, agrees with the positions adopted 
by Lieutenant Whipple. 
.lhave experienced not a little difficulty in bringing in Captain Marcy’s map of the expedi- 
tion to the sources of the Red river in 1852. Astronomical observation with a sextant and 
watch were occasionally made on this exploration by Captain G. B. McClellan, Corps of 
Engineers. Captain McClellan has no report thereon in the printed document, and no 
observations are given, the results being mentioned through the journal or report of Captain 
Marcy. The latitudes of points, as thus given, differ sometimes considerably from the map, 
