How To Know 



THE FRESH-WATER ALGAE 



5^ 



An illustrated key for identifying the more com- 

 mon Fresh-water Algae to genus, with hundreds of 

 species named and pictured and with numerous aids 

 for their study. 



by 



G. W. PRESCOTT, Ph.D. 



Professor of Botany 

 Michigan State University 



Wgods Hole Oceanographic Institution 

 Clark Reading Room 



MARINE 

 BIOLOGICAL 

 LABORATORY 



LIBRARY 



WOODS HOLE, MASS 

 W. H. 0. I. 



WM. G BROWN COMPANY 



Publishers 



DUBUQUE, IOWA 



