LETTER OF TRANSMITTAL. 



U. S. Department of AcxRiculture, 

 Division of Agrostology, 

 ^Ya8]lincJton. I). C. March 21, 1900. 

 Sir: I .submit herewith copy for a third edition of 

 Bulletin No. 7 of this Division, and recommend its pub- 

 lication, the previous editions having- long since been 

 exhausted. In this edition the descriptions of the 302 

 species illustrated have been enlarged, citations of 

 authorities made more complete, and notes added rela- 

 tive to the more important economic species. Further 

 information relative to the economic g-rasses may be 

 found m Bulletin No. 14 of the Division. The intro- 

 ductory matter which appeared in the iirst and second 

 editions is here omitted, as it has been published with 

 the illustrations and descriptions of the genera in 

 American Grasses III. 



The illustrations are from drawings of carefully 

 selected specimens, the habit sketches being made by 

 Mr. A. H. Baldwin and the enlarged details by myself, 

 ^ith the exception of a few which were made by Mrs.' 

 M. D. B. Willis (formerly Miss Baker, of this'^Divis- 

 on). The engraving is the work of Mr. L. S. Williams 

 md Mr. George P. Bartle. 

 Respectfully, 



F. Lamson-Scribxer, 



Hon. James A\ ilsox. 



Secretary of Agriculture. 



