

*7V 



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WISCONSIN GEOLOGICAL AND NATURAL HISTORY SURVEY 



W. O. HOTCHKISS, Director and State Geologist 



BULLETIN NO. 64 



SCIENTIFIC SERIES NO. 13 



'ilL 



The 



/OOLOGY 



Cmtacwt 



Inland Lakes of Wisconsin 



The Plankton 

 I. Its Quantity and Chemical Composition 



By 

 EDWARD A. BIRGE and CIIANCEY JUDAY 



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MADISON, WISCONSIN 



PUBLISHED BY THE STATE 



1922 



