Winslow — The Mapping of Missouri. 77 
The mouth of the Kansas river is only about ten miles too far 
east. The tributaries Gasconade, Osage, ‘‘ Two Charaturns,’’ 
and Grande rivers are located. From the detail shown of 
the Osage river, the results of the later Pike expedition eee 
inafter described, are undoubtedly incorporated in this map.* 
The Pike Expedition was conducted during the years 1805- 
1807. The results were published under the title of «* Account 
of Expeditions to the Sources of the Mississippi and through 
the Western Parts of Louisiana, to the Sources of the Arkansas, 
Kans., La Platte and Piere Juan rivers, etc., by Maj. Z. M. 
Pike.’’ This edition was issued in 1810 by Conrad of Phila- 
delphia, accompanied by large maps. Another edition was 
issued in 1811 by Longman, Hurst, Rees, Orme and Brown of 
London, accompanied by quite small maps, entitled: ‘* Ex- 
ploratory Travels through the Western Territories of North 
America,’’ etc. 
The expedition proceeded up the Mississippi river-from St. 
Louis, noting the course of the stream during their progress. 
Astronomical observations were also taken. On the map ac- 
companying the London edition, the position of the channel of 
the Mississippi is fairly well shown. The position of the 
mouth of the Missouri is taken from Captain Lewis’s deter- 
minations and is the same as that published in the Philadel- 
phia edition of 1814, of the Lewis and Clarkereport. The 
mouth of the Des Moines river is about in the correct position. 
In 1806 Maj. Pike returned to St. Louis and conducted an 
exploration up the Missouri and Osage rivers; the instru- 
ments carried were a sextant, chronometer and compasses. 
From this expedition there resulted what we may term the 
first map of the Osage river. The sketch on the next page dis- 
plays the results as expressed in the map accompanying the 
Philadelphia edition of the report. The remarkable meanders 
of this stream are shown, though not to a great degree of 
accuracy. The Mississippi is also fairly well shown, though 
not so well as on Ross’s map of 1775. The drainage of the 
Ozark region is very imperfectly represented. 
* The report of the Pike expedition was published by the same firm in 
1811, and they hence had the accompanying maps at their disposal in pre- 
paring this edition of the Lewis and Clarke report. 
