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Show CEXTRACT FROM THE ANNUAL REPORT OF THE CHIEF OF ENGINEERS TO THE SECRETARY OF WAR.] OFFICE OF THE CHIEF OF ENGINEERS, Washington, D. C, October 18,1875. • • • • • • • • GEOGRAPHICAL EXPLORATIONS AND SURVEYS WEST OF THE ONE HUNDREDTH MERIDIAN. Officer in charge, First Lieut. George M. Wheeler, Corps of Engineers, having nnder his orders First Lieuts. William L. Marshall, Philip M. IJrice, and Eric Bergland, Corps of Engineers; First Lieut. William L. Carpenter, Ninth United States Infantry; First Lieut. Rogers Birnie, jr., Thirteenth United States Infantry; First Lieut. S. E. Blunt, Ordnance Corps; Lieut. C. W. Whipple, Third United States Artillery, and Lieut. C. C. Morrison, Sixth United States Cavalry; Acting Asst. Surgs. H. C. Yarrow and J. T. Rothrock, United States Army, who, in addition to their professional duties, were engaged in zoological and botanical labors. The following scientists have also been attached to the expedition: Dr. F. Kauipf and Mr. John H. Clarke, astrouomical observers; Messrs. G. K. Gilbert, A. R. Conkling, Jules Marcou, and Douglas A. Joy, geologists; Prof. E. D. Cope and Dr. C. A. White, paleontologists; and Dr. Oscar Loew, mineralogist and chemist. At the commencement of the fiscal year the main divisions of the survey were about leaving their rendezvous at Pueblo, Colo., for the field of operations in Southern and Southwestern Colorado, Northern and Northwestern New Mexico, and Northeastern Arizona, where connection was made with work of former years in areas represented by portions of atlas sheets 61, 62, 68, 69, 70, 76, and 77. ( See progress- map.) Several primary astronomical stations both near to and remote from the field of survey were determined, in addition to the usual field astronomical observations. The several parties were disbanded at Pueblo at the close of the field-season in November and December, following which the requisite number of assistants repaired to Washington for the preparation, during the winter months, of results, and where a small force of draughtsmen aud computers is constantly employed in the reduction of field- notes. The field- work of the present season was divided into two sections, the Colorado and the California, and was begun early in June. A special party intrusted to the charge of Lieutenant Bergland will make a preliminary instrumental survey, with a view to the further and more complete examination of the feasibility of diverting the waters of the Colorado River of the West for purposes of irrigation, and it is hoped that a report and accompanying estimates will be received from the officer in charge of the party in time to be submitted to yott early in the coming winter. Of the six quarto volumes authorized to be published by the act of June 23,1874, as amended by the act approved February 15,1875, two |