Office of the U. S. Geological Exploeation 



OF THE Fortieth Parallel. 



New Haven, August, 1871. 



General : Herewith I have the honor to transmit Volume V of the 

 Geological Exploration of the 40th Parallel. It is a report on the Botany 

 of the region embraced within my hnes of study, and has been made in 

 obedience to your instructions of March 22, 1867. 



The field investigations, as well as analytical and literary labor, have been 

 performed by Mr. Sereno Watson. Very generous herbarium facilities 

 were placed at his disposal by Professor Daniel C. Eaton of Yale College, 

 who also contributes a valuable paper to the volume. 

 Very respectfully, your obedient servant, 



CLARENCE KING, 



Geologist in charge. 



Brigadier General A. A. Humphreys, 



Chief of Engineers, U. S. Army, 



Washington, D. C. 



