BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



6. Colorado River, from the last point north to Monument No. 206, 

 10 kilometers or 6 miles from the town of Yuma, Arizona, latitude 32° 

 44'. longitude 114° 37' 23".4. (Monuments Nos. 205 to 200.) Extent, 

 40.41 kilometers, or 25.11 miles. 



7. California azimuth line, from the middle of the Colorado River, 

 at the last point southwest to the Pacific Ocean, latitude 32° 32', 

 longitude 117° 7' 32".589. (Monuments Nos. 206 to 258.) Extent, 

 226.89 kilometers, or 140.98 miles. 



Of the boundary monuments erected by the engineers of the old 

 Mexican Boundary Surve}'', 43 were identified and repaired or re- 

 placed, and 215 new points were established and marked with iron 

 monuments by the Commission under which I served, which gives a 

 total of 258 monuments now marking the line from the Rio Grande to 

 the Pacific. These are consecutively numbered from east to west, No. 

 1 standing on the right (west) bank of the Rio Grande, and No. 258 

 on the shore of the Pacific Ocean. As the distance is about 1,127 

 kilometers, or 700 miles (including the short section formed by the 

 Colorado River between Monuments Nos. 205 and 206), the average 

 distance apart is 4,380 meters, or 2.72 miles, and in no case has the 

 limit of 8,000 meters been exceeded. Each monument bears its num- 

 ber and inscription. 



In order to facilitate comparison of the records of localities with 

 reference to boundary monuments of the two surveys, the following 

 concordance was prepared, at my request, by Lieut. David Du B. 

 Gaillard, Corps of Engineers, U. S. Army : 



Concordance of old and new numbers of monuments. 



ITINERARY. 



The following is a record of the writer's location each day, from 

 January 30, 1892, to September 12, 1894: 



January 30 to 31^ 1892. — We crossed the line betAveen Indian Ter- 

 ritory and Texas on January 30, traveling thence to Fort Worth. 



