Winslow —The Mapping of Missouri. 69 
meridian lines is presumably Greenwich. On this assump- 
tion the outlines of the State are added to the sketch in fine 
dotted lines, while the outlines of the State with reference to 
topographic features are shown by the dash and dot lines.* 
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Fic. 7. SINEX’S MAP — 1710. 
Initial Merid., presumably at Greenwich. 
The Mississippi is thus shown to be located from 50 to 60 
miles too a west and the mouth of the Missouri 25 miles 
too far nort 
Edward Weis atlas appeared in 1722, and consisted of 
41 maps, of which one is a part of North America. A re- 
duced copy of this is contained in Vol. I of the Reports of 
the 100th Merid. Surveys, opposite p. 511. The longitude 
of St. Louis is here at about 1133° W. and the latitude at 
about 363° N. If the longitudes are referred to Greenwich, 
which is probable, the Mississippi is assigned a position over 
20 degrees west of the true one, a much greater inaccuracy 
than in the earlier Sinex map. The course of the Mississippi 
* A reduced copy of this map is in Vol. I, opposite p. 510 of Reports 
U.S. Geog. Surveys west of 100th Merid., and the annexed sketch is from 
