Report of Capt. Sitgreaves.--Tables of distances, geographical positions, and meterological observations.--Report on the natural history of the country, by S.W. Woodhouse.--Mammals, by S.W. Woodhouse.--Birds, by S.W. Woodhouse.--Reptiles, by E. Hallowell.--Fishes by S. F. Baird and C. Girard.--Botany by J. Torrey.--Medical report by S. W. Woodhouse.