588 APPENDICES. 
straight line drawn from the middle of the Rio Gila, where it unites 
with the Colorado, to a point on the coast of the Pacific Ocean, distant 
one marine league due south of the southernmost point of the port of 
San Diego, according to the plan of said port made in the year 1782 
by Don Juan Pantoja, second sailing-master of the Spanish fleet, and 
published at Madrid in the year 1802, in the Atlas to the Voyage of the 
schooners Sutil and Mexicana, of which plan a copy is hereunto added, 
signed and sealed by the respective plenipotentiaries. 
“Tn order to designate the boundary line with due precision, upon 
authoritative maps, and to establish upon the ground land-marks which 
shall show the limits of both Republics, as described in the present arti- 
cle, the two governments shall each appoint a commissioner and a sur- 
veyor, who, before the expiration of one year from the date of the ex- 
change of ratifications of this treaty, shall meet at the port of San Diego, 
and proceed to run and mark the said boundary in its whole course to 
the mouth of the Rio Bravo del Norte. They shall keep journals, and 
make out plans of their operations; and the result agreed upon by them 
shall be deemed a part of this treaty, and shall have the same force as if 
it were inserted therein. The governments will amicably agree regard- 
ing what may be necessary to these persons, and also as to tbeir respec- 
tive escorts, should such be necessary. 
“ The boundary line established by this article shall be religiously 
respected by each of the two Republics; and no change shall ever be 
made therein, except by the express and free consent of both nations, 
lawfully given by the general government of each, in conformity with 
its own constitution, : 
Serena 
B. 
Official Instructions from the Department of the Interior to 
Joun R. BartLert, Commissioner on the part of the 
United States, for running and marking the Boundary 
line between the United States and the Republic of Mexico. 
DepartMENT oF THE INTERIOR, 
August 1, 1850. 
Sir: In a letter from the Department, bearing date of June 19, 
1850, you were informed thgt you had been appointed Commissioner 
