



WISCONSIN GEOLOGICAL AND NATURAL HISTORY SURVEY 



W. O. HOTCHKISS, Director and State Geologist 



BULLETIN NO. 64 



SCIENTIFIC SERIES NO. 13 



The 



Inland Lakes of Wisconsin 



The Plankton 

 L Its Quantity and Chemical Composition 



By 

 EDWARD A. BIRGE and CHANCEY JUDAY 



MADISON, WISCONSIN 



PUBLISHED BY THE STATE 



1922 



