OF THE BOUNDARY COMMISSION. 541 
The meteorological observations, including the 
barometrical profile of the comparison of the aneroid and 
barometer, and the temperatures of the different springs, 
etc., etc., met with on the route, were by Marine T. 
W. Chan die Esq. 
The aaa. exhibiting the characteristic features 
of the country, were ede by Henry C. Pratt, and A. 
de Vaudricourt, Esqs.* 
2. At the Presidio of San Eleazario, El Paso, Fron- 
teras, Dofia Ana, and the Initial Point on the Rio 
Grande, a more extensive series of astronomical and 
magnetic observations were made, and the latitude 
and longitude of these several places determined by” 
Lieutenant Whipple personally. Lieutenant W. also 
erected an astronomical observatory at Fronteras, where 
& most interesting and elaborate series of astronomical, 
magnetic, and meteorological observations were made, 
the latter by Mr. Chandler, who continued them after 
Lieutenant Whipple had taken the field to conduct the 
survey westward. 
3. At the Copper Mines, in the Rocky Mountains 
(afterwards Fort Webster), at an elevation of six 
thousand two hundred feet above the level of the sea, 
the latitude and longitude were ‘determined by Lieu- 
tenant Whipple, and the meteorological observations 
continued by Mr. Henry C. Force, assisted by Mr. 
James H. Houston. 
While the Commission was waiting for Colonel 
* The latter accompanied the parties, and soon after his arrival at 
El Paso left the Commission. Mr. Pratt came up with a train a few 
months later, and took a large number of sketches. 
