Louis, and up the Illinois River from its mouth to its
source. This would give me a personal knowledge of three great valleys,
which I had not before explored, and connect my former southern
explorations in Arkansas and Missouri with those of the great lake
basins and the upper Mississippi. I had been at the sources and the
mouth of that great river, and I had now the opportunity to complete the
knowledge of its central portions. It was with the utmost avidity,
therefore, that I turned my face again towards the West.
Mr. Calhoun, who was written to on the subject, concurred in this plan,
and extended the time for the completion of my geological report.
_Joint Work on the Scientific Results of the Expedition of 1820_.--
General Cass, who had been written to, thus expresses himself on this
subject:--
"Captain Douglass has informed me that you and he meditate a joint work,
which shall comprise those objects, literary and scientific, which could
not properly find a place in a diurnal narrative.
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