Office of the U. S. Geological Exploration 
OF the Fortieth Parallel. 
Neio Haven, August, 1871. 
GtENEral : Herewith I have the honor to transmit Vohnne V of tlni 
Geological Exploration of the 40th Parallel. It is a report on the I)otany 
of the region embraced within my lines of stndy, 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. HuMrnREYS, 
Chief of Engineers, U. S. Army, 
Washington, I). C. 
