EXPLORATIONS FROM A. D. 1852 To A. p. 1857. 83 
The following named reports can be consulted in relation to it: 
Ist. The reports of the Secretary of the Interior, one dated February 27, 1850, printed 
Senate Ex. Doc. No. 34, 1st session 31st Congress; and another dated July, 1852, which is 
printed Senate Ex. Doc. No. 119, 1st session 32d Congress. | 
These contain various letters from different individuals and sketch maps in reference to the 
initial points of the boundary line on the Pacific shore, at the juncture of the Gila and Colorado 
rivers, and on the Rio Grande. 
2d. Extract from a journal of an expedition from San Diego, California, to the Rio Colorado, 
from September 11 to December 11, 1849, by A. W. Whipple, lieutenant United States 
Topographical Engineers; printed Senate Ex. Doc. No. 19, 2d session 31st Congress. 
3d. Report of Lieutenant Colonel J. D. Graham, Topographical Engineers, Senate Ex. Doc. 
No. 121, 1st session 32d Congress. 
This is a narrative by Colonel Graham of his connexion as astronomer with the establishment 
of this line, and is accompanied by numerous letters from different persons. One of which is 
Lieutenant Whipple's report to Colonel Graham on the survey of the Gila. This report of 
Colonel Graham is also accompanied by a “ barometric profile of the route from San Antonio via 
Castorville, Fort Inge, Howard's Spring, Ojo Escondido, Eagle Spring, El Paso del Norte, and 
Doña Ana, to the Copper mines of Santa Rita, in New Mexico, in 1851; from observations by 
and under the direction of Brevet Lieutenant Colonel J. D. Graham, United States Topo- 
graphical Engineers, assisted by Lieutenant W. F. Smith, Topographical Engineers, and Mr. J. 
Lawson, and computed by Lieutenant G. Thom, Topographical Engineers." The profile is on 
a horizontal scale of twenty mile to an inch, the vertical scale being 105,5. times greater. 
Colonel Graham acknowledges, in terms of commendation, the aid received by him from 
Lieutenant Whipple, Topographical Engineers, Lieutenants Tillinghast and Burnside, United 
States army. 
4th. ‘‘Personal Narrative of Explorations and Incidents in Texas, New jm California, 
Sonora, and Chihuahua, connected with the United States and Mexican Boundary Commission, 
during the years 1850-51-52, and '53. By John Russell Bartlett, United States Commissioner 
during that period; in two volumes, with maps and illustrations. Published by D. Appleton & 
Co., Nos. 346 and 348 Broadway, New York, and No. 16 Little Britain, London. —1854." 
In page 11 of the preface to this work, Mr. Bartlett says: ‘‘The maps of the survey, as well 
as the astronomical, magnetic, and meteorological observations, with all that strictly appertains 
to the running and marking the boundary line, were, by the instructions of the Secretary of the 
Interior, placed in charge of the surveyor, Brevet Major W. H. Emory, who alone is held 
responsible for the faithful performance of these duties. , From the high character of that 
officer as an engineer, the public may expect, in proper season, a satisfactory account of his 
labors in these departments. Sometime must elapse before the maps to illustrate the whole 
boundary from one ocean to the other can be completed; I have therefore been compelled to 
construct, meanwhile, the map prefixed to this work from my own itinerary and from the most 
authentic information that could be obtained.’ 
This work contains, among other things of interest, an account of the country south of the 
boundary, on the route from El Paso via the Guadalupe Pass to Guaymas; and also of a journey 
through Chihuahua, Coahuila, and New Leon, to the Rio Grande. 
5th. ‘‘Report on the United States and Mexican Boundary Survey, made under the direction 
of the Secretary of the Interior, by William H. Emory, major first cavalry and United States 
Commissioner. emen: Cornelius Wendell, printer. 
