"CHAPTER III. 
EXPLORATIONS FROM. A. D. 1843 TO ۸ D. 1859, - 
CAPTAIN J. C. FREMONT, T. E., EXPLORATION, 1843-44. EU $3.6 FREMONT, EE IN 184546. — LIEUTENANT 3. W. ABERT, 
T. E, 1845.— W.B. FRANELIN, T. E., RECONNAISSANCE, 1845. MAJOR W. H. EMORY, T. B., 
RECONNAISSANCE, 1846-'47.—LIEUTENANT J. W. ABERT, T. E., RECONNAISSANCE, 1846-'47.—LIEUTENANT COLONEL P. 8T. GEORGE COOKE, 
, 1847~48-'49.— LIEUTENANT G. H. peer; *. E , RECONNAISSANCE, HR ae 3. B. iniri: E., — MOUTH 
or RIO pae 1847.—LIEUTENANT J. H. SIMPSON, T. E., RECONNAISSANCE ALONG THE CANADIAN RIVER, 1849.—LIEUTENANT J. H. 
COUNTRY, 1849 arem R. B. MARCY, U.S. A , EXPEDITION, 1849.—CAPTAIN H. STANSBURY, 
T. E, EXPEDITION TO GREAT SALT LAKE, 1849-50 .—MARCH OF RIFLE REGIMENT TO OREGON, 1849.— MAJOR WOOD, U. 8. INF., AND 
CAPTAIN POPE, T. E, EXPEDITION TO RED RIVER, 1849.—BREVET LIEUTENANT COLONEL JOHNSON, T. E., RECONNAISSANCES IN TEXAS, 
1849—50—51.—TOPOGRAPHICAL BUREAU MAP OF TERRITORY OF UNITED STATES WEST OF THE MISSISSIPPI, 1850.—R. H. KERN, C. Bey 
RECONNAISSANCE ON THE PECOS RIVER, 1850 —LIEUTENANT J. 6۰ PARKE, T. E., MAP OF NEW MEXICO, 1851 Si veteran SITGREAVES, T. E., 
AND LIEUTENANT WOODRUFF, T. E., BOUNDARY OF CREEK COUNTRY, 1850-51 .—ÜAPTAIN SITGREAVES, T. E., EXPEDITION TO ZUNI AND 
COLORADO RIVERS, 1851.—LIEUTENANT G. H. DERBY, T. E., RECONNAISSANCE MOUTH OF COLORADO RIVER, en -—laguTENANT I. C. 
WOODRUFF, T. E و‎ RECONNAISSANCE, 1852.—CAPTAIN R. B. MARCY, U. 8. A., EXPEDITION TO SOURCES OF RED RIVER. 
CAPTAIN J. G, FRÉMONT'S SECOND EXPLORATION, 1843 AND 1844. 
The title of the printed report is ‘‘Report of the Exploring Expedition to the Rocky Mountains 
in the year 1842, and to Oregon and North California in the years 1843—44. By Brevet Captain 
J. C. Frémont, of the Topographical Engineers, under the orders of Colonel J. J. Abert, chief of 
the Topographical Bureau ; printed by order of the Senate of the United States. Washington: Gales 
& Seaton, printers. —1845."" Senate Doc. No. 174, 28th Congress, 2d session. 
This book contains a reprint of the report of the exploration in 1842, and the accompanying 
map exhibits the routes followed during that expedition, as well as during the years 1843 and 
1844. The longitudes given on this map and in this report (pp. 100 and 101) differ materially 
from those of the first report and map; the reason for the change being explained on page 321. 
The new map is on a scale of 32 miles to an inch, and is ‘‘strictly confined to what was seen 
and to what was necessary to show the face and character of the country." It was drawn by 
Charles Preuss, whose skill in sketching topography i in the field and in representing it on the 
map has probably never been surpassed in this country. The map, which in most respects 
may serve for a model, exhibits also a profile, made from barometrical observations, drawn 
with a horizontal scale of 1 to 3,000,000, or 47.35 miles to an inch, and a vertical scale 
about 30 times greater or 8,500 feet to the inch. 
A “topographical map of the road from Missouri to Oregon, commencing at the mouth of 
the Kanzas, in the Missouri river, and ending at the mouth of the Walla- Walla, in the 
Columbia, in seven sections, from the field notes and journal of Captain J. C. Frémont, * and 
from sketches and notes made on the ground by his assistant, Charles Preuss, compiled 
by Charles Preuss in 1846, by order of the Senate of the United States,’’ forms a part of 
House Com. Report No. 145, second session 30th Congress. Its scale is 10 miles to the inch. 
It contains detailed topography and full notes of the route pursued by Captain Frémont 
© Frémont did not receive his promotion to the rank of brevet captain until the termination of his second expedition. 
