68 Trans. Acad. Sci. of St. Louis. 
On one of these, which is a strikingly crude production, the 
Ouabach, or Ohio river, is shown to empty into the Missis- 
sippi, opposite the mouth of the Missouri. This map is note- 
worthy as being the first one, to the writer’s knowledge, on 
which the name Osage is applied to a tributary of the Mis- 
souri river. It is the one on which La Hontan shows his 
mythical ** Riviere Longue,’’ or ‘*Dead River,’’ which he 
claims to have explored. The lines of latitude and longitude 
are designated on the map, the latter being presumably east 
from Ferro island, as that point had been generally accepted 
by European mathematicians as the position of the initial 
meridian as much as seventy years previous. According to 
these lines the Mississippi river is as much as 100 miles west 
of its true position, and the mouth of the Missouri about 
180 miles too far south. 
The Delisle maps (1703 and 1707) are joint productions 
of the father and son, Claude and Guillaume Delisle. 
Winsor speaks of them as the most distinguished French 
cartographers of the early part of the eighteenth century. 
Their map of the upper part of the Mississippi valley, under 
the title of «* Carte du Canada ou de la Nouvelle France,”’ * 
shows the Missouri river and the location of the old Fort St. 
Louis. The Des Moines river is shown under the name 
R. de Moingona. In their map of the lower part,f the Ozark 
mountains are faintly suggested and are labeled «* Pays plein 
de Mines;’’ this we find reproduced in several subsequent 
maps and it is perhaps based upon Penicault’s report of the 
existence of lead mines west of St. Genevieve, which infor- 
mation he acquired when accompanying Le Sueur’s expedi- 
tion up the Mississippi in the year 1700. 
Sinex’s (John) Map of North America was published in 
London in 1710. A sketch of a portion is presented on p. 69. 
The course of the Mississippi is much more accurately shown 
than on any of the previously presented maps, as is also the 
lower course of the Missouri. The initial point for the 
* This map is reproduced in Winchell’s Vol. I, p. 20, Final Report Geol- 
Survey of Minn. 
_ +A reproduction of this portion of the map is contained in Winsor’s 
Nar. and Crit. Hist, Vol. II, p. 294, 
