I. OFFICIAL REPORTS OF THE EXPEDITION OF 1820. 



1. DEPARTMENTAL REPORTS. 



I. Announcement of the Return of the Expedition. By Hon. Lewis Cass. 

 IL General Report to the Department of War. By Hon. Lewis Cass. 

 IIL Fui'ther Explorations of Western Geography recommended. By Hon. Lewis 

 Cass. 



IV. Personal Testimonial on the close of the Expedition. By Hon. Lewis Cass. 



2. TOPOGRAPHY AND ASTRONOMY. 



V. Results of Observations for Latitudes and Longitudes during the Expedition of 



1820. By David B. Douglass, Capt. Engineers, U. S. A. 



3. MINERALOGY AND GEOLOGY. 



VI. Report on the Copper JNIines of Lake Superior. By Henry R. Schoolcraft. ' 



VII. Observations on the Mineralogy and Geology of the country embracing the 

 sources of the Mississippi River and the Great Lake Basins. By Henry R. 

 Schoolcraft. 



VIII. Report in reply to a Resolution of the U. S. Senate on the Value and Extent 

 of the Mineral Lands on Lake Superior. By Henry R. Schoolcraft. 



IX. Rapid Glances at the Geology of Western New York, beyond the Rome summit, 

 in 1820. By Henry R. Schoolcraft. 



X. A Memoir on the Geological Position of a Fossil Tree in the secondary rocks of 



the Illinois. Albany: E. & E. Hosford, pp. 18, 1822. By Henry R. School- 

 craft. 



4. BOTANY. 



XI. List of Plants collected by Capt. D. B. Douglass at the sources of the Missis- 

 sippi River. This paper has been published in the 4th vol. p. 5G of Silliman's 

 Journal of Science. By Dr. John Torrey. 



5. ZOOLOGY. 



XII. A Letter embracing Notices of the Zoology of the Northwest, addressed to 

 Dr. Mitchell on the return of the Expedition. By Henry R. Schoolcraft. 



