Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb. A report on an exploration of the country lying between the Missouri River and the Rocky Mountains, on the line of the Kansas and Great Platte rivers [1842].- Catalogue of plants collected by Lieut. Fr{acute}emont in his expedition to the Rocky Mountains. By John Torrey.- A report of the exploring expedition to Oregon and north California, in the years 1843-'44.- App. A. Nature of the geological formations occupying the portion of Oregon and north California included in a geographical survey under the direction of Capt. Fr{acute}emont; by James Hall.- App. B. Descriptions of organic remains collected by Capt. J. C. Fr{acute}emont, in the geographical survey of Oregon and north California; by James Hall.- App. C. Description of some new genera and species of plants, collected in Capt. J. C. Fr{acute}emont's exploring expeditions to Oregon and north California, in the years 1843-'44; by John Torrey and J. C. Fr{acute}emont.- Astronomical observations made during the expedition of 1843-'44.- Meteorological observations made during the expedition of 1843-'44. Astronomical observations made during the expedition to the Rocky Mountains in the year 1843.- Meteorological observations [1842]