LETTER OF TRANSMITTAL. 



U. S. Department of Agriculture, 



Bureau of Forestry, 

 Washington, D. C, June 27, 1903. 

 Sir: I have the honor to transmit herewith a report entitled "The 

 Diminished Flow of the Rock River in Wisconsin and Illinois, and 

 its Relation to the Surrounding Forests," by G. Frederick Schwarz, 

 Field Assistant in the Bureau of Forestry, and to recommend its 

 publication as Bulletin No. -L4 of the Bureau of Forestry. 



The four plates and two maps accompanying this bulletin are neces- 

 sary for its proper illustration. 



Very respectfully, 



Hon. James Wilson, 



Secretary of Agriculture. 



Gifford Pinchot, Forester. 



