CHAPTER VII.

Trip through the Miami of the lakes, and the Wabash Valley--Cross the grand prairie of Illinois--Revisit the mines--Ascend the Illinois--Fever--Return through the great lakes--Notice of the "Trio"--Letter from Professor Silliman--Prospect of an appointment under government--Loss of the "Walk-in-the-Water"--Geology of Detroit--Murder of Dr. Madison by a Winnebago Indian.