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Show PEEFATOEY NOTE. xiii E. E. Howell, whose elaborate notes were placed in the hands of Captain Dutton, and from time to time he has in his volume given Mr. Howell credit for the material which he has used. It was unfortunate for Mr. Howell that his labor was suspended prematurely, and that he was not able to elaborate a report upon the country studied by him. The geography of the district, as exhibited in the atlas accompanying this volume, was the study of Prof. A. H. Thompson, who was my assistant in charge of that branch of the work during the earlier years of exploration and survey. Through his skill and industry the geography has been represented with all the accuracy and detail that the adopted scale will permit. I am especially indebted to Brig. Gen. S. V. Ben^t, chief of the Ordnance Bureau, for the interest he has taken in the geologic and geographic researches prosecuted by the survey under my direction. Through the wise policy of administration adopted b}^ him, Captain Dutton has been enabled to carry on his labors as a geologist outside of the general operations of the Ordnance Bureau. The contribution to science which he here presents will abundantly justify the course pursued by his distinguished chief. To the Secretary of War and the General of the Army, the survey is indebted for assistance rendered in various ways-especially in furnishing subsistance to field parties from the commissariat of the Arm)', but chiefly in the opportunity given Captain Dutton to prosecute his researches. J. W. POWELL. April 1880. |
