42 
CLOSING REMARKS. 
than those of the engineering difficulties ; and so far as they are concerned, I am clearly of the 
opinion that the work can he accomplished, under judicious superintendence, and with a liberal 
supply of means, within eight years. 
Before closing this report, I take pleasure in stating that much credit is due to my several 
assistants, Messrs. Albert H. Campbell, 1ST. H. Hutton, H. Custer, George G-. Garner, Dr. 
Thomas Antisell, and J. Nevin King, for the ability, zeal, and fidelity with which they dis¬ 
charged their respective duties, both in the field collecting the data, and in the office collecting 
and compiling the results. To Mr. Albert H. Campbell, civil engineer and surveyor, I am under 
many obligations for the efficient aid rendered in conducting the tributary reconnaissances when 
the main party was divided, and for much valuable information contributed in regard to the 
location of the road and its details. To Dr. Antisell was entrusted the geological investigations; 
his report is appended, and is of itself a sufficient evidence of the great energy he displayed in 
collecting the facts and data therein detailed. It is a valuable paper, and will doubtless contribute 
much towards the full development of the geology of those very interesting districts, the Coast 
Range of California and the great plateau of the continent. Lieutenant George II. Mendell, 
Corps Topographical Engineers, accompanied the expedition from Benicia to San Diego, Cali¬ 
fornia, by authority of General Wool, commanding the department of the Pacific. For his 
many kind offices, warm interest in the success of the exploration, and valuable assistance ren¬ 
dered, he has my grateful acknowledgments. 
Lieutenants William A. Winder and George T. Andrews, of 3d regiment artillery, were each, 
in turn, in command of the escort—the former while in California, up to the time of our reaching 
San Diego, and the latter thence to Fort Fillmore, on the Rio Grande. The field duties of the 
party being then completed, the services of the escort were dispensed with, and Lieutenant 
Andrews returned with his command to California. 
