LETTER OF TRANSMITTAL. 
U. si DEPARTMENT OF AGRICULTURE, 
jd DIVISION OF AGROSTOLOGY, 
Washington, D. C., May 3, 1899. 
Sin: I have the honor to transmit herewith the manuscript of a 
paper entitled“ Synopsis of the genus Sitanion,” prepared under my 
direetion by Mr. Jared G. Smith, assistant agrostologist, and recom- 
mend the same for publication as Bulletin No. 18 of this division 
under the general title of ** Studies on Ameriean Grasses." 
Respeetfully, 
; F. LAMSON-SCRIBNER, 
Agrostologist. 
Hon. JAMES WILSON, 
Seeretary of Agriculture. 
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