Winslow —The Mapping of Missouri. 85 
The location of St. Louis was variously established as 
follows :— . 
Lat. (mean of three observations), 38° 36’ 18” N. 
RIO FR: = 90" -Go4s Ws 
‘+ (from traverse measurements 
from mouth of Ohio), 90° 2° 35" Ws 
veal 
ASF 
if fe p atte 
Little pi 
> ae 
7a 
Fig. 12. LONG MAP — 1820. 
Initial Merid. at Greenwich. 
The mouth of the Missouri river was similarly determined 
to be at: 
Lat. (mean of four determinations), 38° 51’ 39” W. 
Long. (from lunar observations), 89° 57’ Ww. 
Long. (from traverse measurements), 90° 00’ 40” W. 
These first two results accord quite closely with Capt. 
Lewis’s earlier observations. 
