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Show 110 Baron Osteu- Saekeu, Mr. G. N. Lawrence, Mr. Thomas Bland, Prof. S. Olnev, Mr. K. H. Stretch, Mr. Aug. R. Grote, Dr. William Hoiden, Mr. Edward Norton, Dr. Elliott Coues, U. S. A., Prof. Asa Gray, Mr. J. H. Milner, Dr. A. S. Packard, jr., Mr. S. C. Scudder, and others. In conclusion, I beg leave to express thanks for the groat interest manifested in this branch of the work committed to your charge as well as for the facilities you have always afforded for making collections. With the hope that, as in the past, the future may find you alive to the importance of the natural- history wants of the period, I have the honor to be, very respectfully, your obedient servant, H. C. YARROW, Surgeon and Naturalist to Expedition. Lieut. G. M. WHEELER, Corps of Engineers, U. S. Army. PHOTOGRAPHS. As heretofore, a photographer has accompanied the expedition, following a route from Santa F6 westward, via Fort Wingate; thence to Camp Apache, and the vicinity of the Sierra Blanca range, Arizona; thence northward, via old Fort Defiance, Moquis Pueblos, and the Canons of the Colorado. A great variety of negatives, of which a few prints have been taken, were secured, illustrative of natural scenery, the habits and customs of the Indian tribes, ancient ruins, & c. • During the season, the executive officers of parties have gained valuable experience in the subjects of observation intrusted to their charge. The property, purchasing and disbursing branches have been faithfully aud efficiently filled by Assistants Francis Klett and George M. Lockwood. OFFICE. While the expedition of 1873 was in the field, three draughtsmen and one computer were employed in the office, and completing results to the close of the season of 1872, both topographical and meteorological, and those of 1873 are well advanced. The great mass of geographical information obtained auuually obliges this method, which proves to be most economic. CONCLUSION. The progress and improvement of the survey have passed through successive stages since its commencement in 1869. It is believed that in its present efficient state it answers a want of the War Department and the country, and has at its foundation a judicious economy. The results are available to other executive departments of the Government than the War Department, and incidentally to the industries of the region surveyed. While suggesting the propriety of the continuance of the survey, a few of the many classes of information are here noted, the results from which are believed to be of constant necessity and usefulness in the War Department: 1st. The published maps, profiles, and compiled distances over present and future routes of communication and supply that look to a saving in cost of transportation of all materials and munitions of war and other supplies forwarded through the Quartermaster's Department of the |