Report of a geological reconnaissance in California: made in connection with the expedition to survey routes in California, to connect with the surveys of routes for a railroad from the MississippiRiver to the Pacific Ocean, under the command of Lieut. R.S. Williamson, Corps Top. Eng'rs, in 1853 . By William P. Blake ... With an appendix containing descriptions of portions of the collection, by Prof. Louis Agassiz, Aug. A. Gould, M.D., Prof. J.W. Bailey, T.A. Conrad, Prof. John Torrey, Prof.Geo. C. Schaeffer, J.D. Easter, PH. D

"Article VIII [of appendix] was not received in time for publication with the other portions of this report."

Appendix: 1. Notice of the fossil fishes, by L. Agassiz. II. Descriptions of the fossil shells, byT.A. Conrad. III. Catalogue of the recent shells, with descriptions of the new species, by A.A. Gou ld. IV. Letter from J.W. Bailey, describing the structure of the fossil plant, from Pasuncula River.V. Description of the structure of the fossil wood from the Colorado desert, by G.C. Schaeffer. VI. Chemical examinations of the soils and incrustations, by J.D. Easter. VII. Description of the plant s collected by W.P. Blake along the route and at the mouth of the Gila, by J. Torrey. VIII. Descriptions of fossil microscopic organisms, from Monterey, by J.W. Bailey.