419: Albany, 1821.] About four thousand miles were traversed.

Of this distance the topography was accurately traced by Captain Douglass and his assistant, Mr.Trowbridge.This officer also took observations for the latitude at every practical point, and collected with much labor the materials for a new and enlarged map.

Its geology and mineralogy were the subjects of a detailed report made by me to the War Department in 1822.

Of the copper deposits on Lake Superior, a detailed report was made to the same department in November 1820.

The Indian tribes were the subject of observation made by General Cass.