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Show 8 at the Argentine Pass, and from this date to July 4 the party worked about the heads of the Blue and Platte Rivers, in the cross rauge between Middle and South Parks, and in the Blue River range, making the ascent of Lincoln Peak and such other stations as were necessary to give a knowledge of the topography of this region. Leaving the collecting party at Fair Play with orders to move camp to Twin Lakes, on the west side of the Upper Arkansas River, by August 1, the field party proceeded to survey the mountain- ridges bounding South Park, examined the country about the heads of the North Fork of the South Platte; the Kenosha range from Mount Evans to the Platte and Arkausas divide; this divide from the southeastern limit of South Park to the head of the South Fork of the South Platte River, meandering en route the principal roads and streams, and making the necessary stations upon inouutain- peaks to check by triangulation the principal points of the survey. Wet Mountain Valley was visited, and the Arkansas River traced from near Oanou City to Granite C. H., at which place we arrived August 1, 1873. During this interval, July 5 to August 1, Mr. Schroeder was employed with a small topographical party in collecting topographical data and in meandering roads aud streams in South Park not traced upon the plats of the General Land- Office, and not visited by my own party. From the non- arrival of supplies forwarded by the Quartermaster's Department from Cheyenne, a delay of several days was necessitated, which interval was spent in the immediate vicinity of Twin Lakes in collecting topographical details. A base was measured and an accurate trigonometric survey of the lakes made, and the topographical features relatively located from it. Two lines of soundings across either lake were made at the request of Prof. Stevenson. On the Oth of August, having purchased the uecessary supplies, the geologist and topographer were sent to visit the mines at Oro City, Colo., and McNutty gulches, and Homestrike Mountain, and to examine the country about Ten- Mile Creek, one of the tributaries of the Blue River; the western slope of the Blue River range; to meander Eagle River and its main branches, and to define the northern limit of the main or Saguache range west of the Arkansas River. This party having accomplished its object, returned to the permanent camp at Twin Lakes ou August 18. On the following day, still leaving the collecting party at Twin Lakes with facilities to extend the field of their investigation wheresoever they pleased, two topographical parties were dispatched- Mr. Schroeder, assistant topographer, to collect topographical data and meander the streams flowing into the Arkansas north of Lake Creek j to fix the water- shed and locate the heads of the middle branch of the Roaring Fork of the Grand River; while my own party crossed the divide at the head of Lake Creek, and from August 19th to September 3rd were engaged about the heads of the Gunnison River, aud the southern tributaries of the Roaring Fork of the Grand River statious were made upon prominent peaks ia the Elk Mountains, and also in the Saguache rauge at the heads of Chalk and Cottonwood Creeks, and the canon of Taylor River traced to the junction of this stream with East River. On the 3d or September the party was joined by Mr. Nell, chief of triangulation, from Fort Wingate, N. M. On September 5tb, he was sent with orders to make triangulation-stations near the junction of the Eagle and Grand, at the northern extremity of the Saguache range, in the Blue River range, upon Gray's Peak and Mount Evaus, connecting the former with the astronomical |