TO INDIANOLA. 
3 
of San Diego, and the middle of the Eio Gila, where 
it unites with the Colorado, were determined by means 
of an elaborate series of astronomical observations, by 
the Topographical Engineers intrusted with these du- 
ties. A considerable portion of the straight line con- 
necting these points was also run. 
In February, 1850, it was found impracticable to 
advance eastward beyond the mouth of the Gila, and 
towards the frontier of New Mexico, in consequence 
of the difficulties attending the fitting out of large 
parties for the important service to be performed. 
The Commission then adjourned, to meet at El Paso, 
in the State of Chihuahua, on the first Monday of No- 
vember following. 
Soon after the adjournment, Mr. Weller was re- 
moved, and Colonel J. C. Fremont appointed to 
his place; but before the latter gentleman entered 
upon his duties as Commissioner, he was elected by 
the people of California, to represent that State in the 
Senate of the United States. Elected to so distin- 
guished an office. Colonel Fremont did not hesitate to 
resign his place as Commissioner on the Boundary, 
when I was honored by President Taylor with the 
appointment to succeed him. 
I received my letter of appointment in June, 1850, 
when I immediately set to work, to organize such a 
party as would be necessary to carry on the survey, 
and to procure the outfit required for the service. 
Here was a preparatory labor of several months. But, 
as I was required to be at El Paso del Norte, on the 
Rio Grande, on the 1st Monday in November, the day 
on which the joint Commission was to meet, agreeably 
