SMITHSONIAN INSTITUTION. 



UNITED STATES NATIONAL MUSEUM. 



DIRECTIONS FOR COLLECTING RECENT AND 

 FOSSIL PLANTS. 



BY 



F. H. KNOWLTON, 



Assistant Ctiraior of the Department of Hot 



Part B of Bulletin of the United States National Museum, No. 39. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE, 

 iSqi. 



