84 Trans. Acad. Sci. of Si. Louis. 
Engineers under the direction of Wm. Rector, Surveyor of 
the U.S. for the territories of Missouri and Illinois, and was 
presented by the latter to the General Land Office. It was 
presented as probably the most correct map of the country 
extant at that time.* In it are presumably incorporated the 
results of the meridian and boundary surveys which had been 
made in Missouri prior to that date. The Mississippi river 
is, however, placed from 60 to 100 miles east of its true 
position, andthe mouth of the Kansas river is fully 30 miles 
too far east. St. Louis and the Missouri river are some 80 
miles south of where they should he. These results indicate 
that the observations of the preceding Lewis and Clarke and 
Pike expeditions were not made use of. 
The Long Expedition was conducted during the years 1819 
and 1820. The results are published under the title of 
‘+ Account of an Expedition from Pittsburg to the Rocky 
Mountains,’’ etc., ‘* compiled by Edwin James, botanist and 
geologist for the expedition, In two volumes with an atlas.”’ 
Philada: H.C. Carey and I. Lea, 1823. The party proceeded 
down the Ohio river to its mouth, and thence up the Miss- 
issippi and Missouri rivers. They were provided with chrono- 
meters, sextants, compasses and a telescope. Their results 
are embodied in a map accompanying the report, on a scale 
of about 75 miles to the inch. A portion is shown on the 
sketch on page 85, which is from a tracing of the map. 
Eliot’s determinations of 1797-98, at the mouth of the Ohio 
are quoted and are referred to in later determinations. 
These are: 
Lat. 37° 0' 22.9” N. 
Long. 88° 50’ 42” W. of Greenwich. 
Proceeding up the Mississippi river the position of Cape 
Girardeau was determined. 
From three observations — 37° 18’ 39” N. Lat. 
; From traverse measurements 
from the mouth of the Ohio 89° 17° -- W. Long. 
The mouth of the ‘* Merameg”’ 
river was determined to be at 39° 23’ 29” N. Lat. 
x 
* A reduced copy of this map is published opposite p. 23 of Vol. XI, of 
he reports of the Pacific R. R. Surveys. 
