LETTER OF TRANSMITTAL. 
WASHINGTON, September, 1891. 
Sir: I have the honor of presenting for publication the first volume of the pro- 
posed work called ‘‘ Illustrations of North American Grasses,” which have been 
issued as Bulletin No,-12, parts 1 and m; and it is proposed to follow this with a 
second volume of plates and descriptions of the ‘‘ Grasses of the Pacific Coast.” 
Respectfully, 
GEO. VASEY, 
Botanist. 
Hon. J. M. Rusk, 
Secretary of Agriculture. 
II 
