0 TES, EXPLORATIONS FROM A. D. 1843 To A. D. 1852. 
by a map, drawn by Charles Preuss, on a scale of 1 to 3,000,000, embracing all the country 
between the 104th meridian and the Pacific ocean, and between the 32d and 50th parallels of 
north latitude. It was compiled from the surveys of Captain Frémont and “other authorities,” 
and was at the time of its publication (1848) the most accurate map of that region extant. 
A great deal of information in regard to this expedition, not contained in the memoir, 
has been published in the newspapers and in various pamphlets. 
There are probably many reasons why a complete account of this third expedition, as well 
as Colonel Frémont’s subsequent ones, has never been published; but this desideratum will 
probably be soon supplied.* 
Captain Frémont started upon this exploration better provided than on his previous ones. 
He had under his command Lieutenants J. W. Abert and William G. Peck, Topographical 
Engineers, and was aided by Mr. Charles Preuss and Mr. E. M. Kern, as topographers and 
artists. He was provided with a portable astronomical transit instrument, sextants, chronom- 
eters, and barometers. No map or account has been published of his route East of Bent’s 
Fort, but I believe it is nearly that by which he returned in 1844. He left the frontier 
of Missouri in May, and, on arriving at Bent/s Fort, detached Lieutenants Abert and Peck to 
explore the sources of the Canadian river, and then to return to the States. "The following 
account of his subsequent movements is principally taken from his memoir and map. . 
"The party under Captain Frémont left Bent’s Fort on the 16th of August, 1845, travelled up 
ihe Arkansas to the Utah Pass, at its source, and crossed the divide at the head of Piney ereek, 
a branch of Blue river. Continuing west they crossed Blue river, reached the sources of White 
river, and travelled near it toits mouth. From the crossing of Green river they travelled up 
the left bank of the Uintah to Duchesne's Fork, intersecting Captain Frémont's trail of 1844 a 
short distance east of the point where it crossed that stream; thence they passed up Morin's 
Fork, crossed the divide between the waters of the Colorado river and those of the Great Salt 
lake, near the head of Timpanogos river, which they followed down to its junction with Utah 
lake. They passed around the northern end of that lake and down Utah river to the Great Salt 
lake, which was reached at the point where ** Great Salt Lake aity’’ is now situated. Remain- 
ing here several days, Captain Frémont made astronomical observations and surveyed the lower 
portion of the lake, including Antelope island. 
Leaving the southern shore of Great Salt Lake, they struck northwesterly to Pilot Peak, 
crossing, in so doing, two isolated ranges of mountains. Turning southwest from this point, they 
travelled about 50 or 60 miles to Whitton's Springs, where the party was divided. One por- 
tion, to which Mr. Kern was attached, and which was conducted by Walker, turned southwest, 
crossed the Humboldt River mountains near the head of Crane’s branch of the south fork of 
the Humboldt, continued their southwesterly course, and crossed three distinct mountain 
masses before reaching Moore's creek, in latitude 389 33^ 1 W. petro pro- 
ceeded to the rendezvous at Walker's lake. 
The other party, under Captain Frémont, crossed the Humboldt iiss Res a d 
pass, and descended to the head of the north fork of Humboldt river. This stream had here- 
tofore been named Ogden's or Mary's river. After following it down to what are called the 
^ Sinks," they travelled southward, passing near the mountains, along the eastern shore of 
Carson's lake. They soon struck Walker’s river near its mouth and rejoined the other party. 
® In press, Colonel J. C. grains poco ae by the author, and embracing all bis expeditions.—Childs & 
Peterson, publishers, No. 602, Arch street, Philadelphia, 
