OFFICIAL REPORTS. 



1. Letter to E. Herring, announcing the return of expedition. 



2. Letter to Gov. Porter, subject of Sauc disturbances. 



3. Letter to E. Herring, transmitting report on vaccination. 



4. Letter to E. Herring transmitting report on population and trade. 



5. Statistical tables of population, &c. 



6. Report on the political state of the Indians on the U. Mississippi. 



7. Dr. Houghton's report on vaccination. 



ADDENDA. 



1. Letter to the Dept. transmitting plan and estimates for the Expe- 



dition of 1832. 



2. Instructions. 



3. Letter to Gen. Street, Indian Agent at Prairie du Chien. 



4. Report of the previous Expedition of 1831, as laid before Congress. 



5. Speech of six Chippewa chiefs on the Sioux war. 



[In the arrangement of the above reports and letters, the order of 

 dates is observed.] 



