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Show 7 were measured at Fort Tnlerosa and Port Bayard, and others located to be measured next season. The work of my own party in this section of the country was conducted in the same manner as in Castle Valley during the earlier part of the season $ but. having much more favorable conditions, better results were obtained. About five thousand square miles were covered along the Atlantic and Pacific divide, in the section of country embraced in Atlas sheets Nos. 76, 83, 77, and 84. This has been mapped and is ready to be transferred to the Atlas sheets. Detailed reports of the geology and mineralogy of the region traversed will be submitted by Mr. Howell and Dr. Oscar Loew, Very respectfully, your obedient servant, R. L. HOXIB, Lieut, of Engineers, U. & A. Lieut. GEO. M. WHEELER, Corps of Engineers, U. 8. A. Report of Lieut. W. L. Marshall, Corps of Engineers* UNITED STATES ENGINEER OFFICE, GEOGRAPHICAL EXPLORATIONS AND SURVEYS WEST OF THE ONE HUNDREDTH MERIDIAN, Washington, D. C., Jme 30,1874. SIR : I have the honor to submit the following executive report of the operations of the Colorado party of the expedition for explorations and surveys west of the one hundredth meridian, during the field season of 1873. In accordance with the annual project, approved by the Secretary of War and Chief of Engineers, and pursuant to instructions from you, I organized the party at Denver, Colo., about June 1,1873. Its personnel was as follows: First Lieut. W. L. Marshall, United States Eugineers, executive officer and astronomer; Dr. J. T. Bothrock, acting assistant surgeon, United States Army, surgeon and naturalist ; Prof. J. J. Stevenson, geologist; J. J. Young, topographer; Edgar Schroeder, assist ant topographer; Prof. John Wolf, collector in botany; Bernard Gilpin, meteorologist, and a small escort of enlisted men from the Fifth Infantry. Including packers and employs the party numbered forty- two men. Later in the season we were joined by Mr. Louis Nell, chief of triangulation. Pending the organization of the main party, on the 8th day of June a small topographical party was sent out to define the bases of the mountains, or " hogsbacks," from the mouth of the Platte Canon to Golden City, with orders to join the main party at Georgetown, Colo., on the 16th. On the 17th of June, having received at Georgetown the necessary supplies, I sent the main party, under Dr. Bothrock, to encamp near Fair Play, in South Park, to allow the collectors in natural history an opportunity to make full collections in the several branches in that vicinity, and to establish a meteorological station at the permanent camp. My small party retraced their course to Idaho Springs, visited the mines at Central City and Black Hawk; thence, by way of Chicago Lake and Mount Evans, to Georgetown, making the necessary topographical stations. On June 22 the Atlantic and Pacific divide was crossed |