MAMMALS OF THE MEXICAN BOUNDARY. 5 



two years of the survey, and during; the last year was practically inde- 

 pendent, serying with the Monument-Building Party, which, a- before 

 mentioned, was organized at the end of the first six months and con 

 tinned its work of erecting monuments on site> previously marked, for 

 several months after the survey proper had been dissolved. During 

 this last year, which was spent along the two western azimuth lines 

 and the small Colorado River section of the Boundary Line which con- 

 nects them, my little party of 10 men made independent camps, and. 

 though obliged to keep in the general neighborhood of the monument- 

 builders, selected quiet camps in the most desirable situations and 

 was never hampered by the necessity of caring for the sick, as no 

 serious cases of illness occurred during this period among the now- 

 hardy and veteran engineers and explorers. In addition to the work 

 along the line, two important expeditions were made. The first of 

 these was a reconnoissance of the lower portions of the Gila and Colo- 

 rado rivers from Adonde Station, on the Southern Pacific Railroad, to 

 the mouth of the Gila River at the town of Yuma. Arizona, and thence 

 along the left (east) bank of the Colorado River to the Gulf of Cali- 

 fornia. When the Pacific Ocean was reached, the little camp of the 

 biological section was pitched at the mouth of the Tijuana River, 

 near the last Monument (No. 258) : but the habit of moving on to the 

 westward had so grown upon its members during the three years of 

 their wanderings that arrangements were soon made with the Treas- 

 ury Department at "Washington to carry them out to San Clemente 

 Island, the most outlying of the Santa Barbara group, on the revenue 

 cutter Wolcott, Capt. W. D. Roath commanding. These two expe- 

 ditions were more fraught with adventures and thrilling episodes 

 than any other part of 'the exploration, while they resulted in very 

 considerable gains to science. Of the trip to San Clemente, on which 

 Prof. T. S. Brandegee, an eminent botanist of California, and Mr. 

 A. W. Anthony, a well-known ornithologist, accompanying my party, 

 more will be said later. 



PERSONS WHO PARTICIPATED IN THE FIELD WORK OF THE BIOLOGICAL SECTION. 



The following-named persons were engaged, at different times, in 

 making biological collections in connection with the operations of the 

 International Boundary Commission : 



1. Edgar A. Mearns, captain and assistant surgeon, r. s. Army. From Jaunary 



30, 1892, to September 12. 1S94. 



2. Frank Xaviek Holzner, assistant field naturalist, employed by the 1". S. 



National Museum from January 30 to December in, 1892, and from June 

 1. 1893, to March 31, 1894. When, owing to lack of funds, the National 

 Museum discharged Mr. Holzner at the Colorado River. March 31, 1894, 

 an arrangement was made with the American Museum of Natural 

 History. New York, through Dr. .1. A. Allen, whereby Mr. Holzner was 

 continued with the party to San Diego, California, where he is now 



located and whence, from time to time, specimens of mammals have 1 



sent by him to form a part of the boundary collection. 



