CATALOGUE OF BOTANICAL LITERATUKE. 7 



two catalogues, and appears to be practical if not in accordance with 

 theory. 



The catalogue is only a tool for the use of the worker in botanical 

 literature, and the desire is to make it as complete and workable a 

 tool as is possible. The daily use of the catalogue constantly suggests 

 improvements in both plan and execution, so that its present useful- 

 ness is limited only by the amount of time and labor that can be 

 devoted to it. 



Approved : 



James Wilson, 



Secretary of Agriculture. 



Washington, D. C, July 21^, 1911. 



[Cir. 87] 



O 



