Winslow — The Mapping of Missouri. 83 
the point reached at the end of the past years work was 36° 
30’ 11”. Thence the course of the St. Francois river was 
meandered out down to a determined latitude of 36° N. 
Thence a line was run due east to the Mississippi river. 
The Brown survey, probably on account of the acknowl- 
edged inaccuracies and for other reasons, was not acceptable 
and, hence, we find, in the year 1843, a new survey of the 
southern boundary of the State begun under the direction of 
a joint commission from Missouri and Arkansas, in accordance 
with acts of the respective legislatures. The survey was begun 
on the Mississippi river on the latitude 36° N. which was 
determined with a sextant and an artificial horizon. The line 
was run thence west to the St. Francois river, a distance of 36 
miles and 50 chains. It was found throughout its whole 
length, to be about 600 yards N. of the line determined by 
the Brown survey. Thence, they proceeded north to a point 
on the St. Francois river which they determined to be at 36° 
30’ N. and about one chain north of the old Brown line. 
The line thence ran W. soon crossed the Brown line and 
kept south of it the remainder of the distance. At no other 
point, however, was it so much as a half a mile south. It 
terminated 4.83 chains due south of the southwestern corner 
of the State, as marked by Brown in 1823. This last survey 
made the south line of the State about ten miles longer than 
did the earlier one and this latter result accorded with the Land 
Office surveys. This appears to be a carefully conducted sur- 
vey and a neatly drawn map of the line accompanies the copy 
of the original notes in the Land Office at Jefferson City. The 
line as marked by this survey was accepted as the south 
boundary of the State and is still recognized as such. 
Returning from this digressive sketch of the history of the 
State boundary surveys we will take up again the chronologic 
notice of explorations and maps of our area. 
Rector’ s and Roberdeau’s map, was compiled in the year 
1818. It is entitled ‘* Sketch of the Western part of the 
“enone of North America, between latitudes 35° and 52° 
N,’ 1t extends from the 87th Meridian to the Pacific ocean, 
and 1s on a scale of about 47 miles to the inch. It was 
originally drawn by Roberdeau of the U. S. Topographic 
