Summary Narrative of an Exploratory Expedition to the Sources of the Mississippi River, in 1820 Resumed and Completed, by the Discovery of its Origin in Itasca Lake, in 1832

CHAPTER XVI.

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The expedition proceeds from Prairie du Chien up the Wisconsin Valley--Incidents of the ascent--Etymology of the name--The low state of its waters favorable to the observation of its fresh-water conchology--Cross the Wisconsin summit, and descend the Fox River to Winnebago Lake 178