76 



PLANKTON OF WISCONSIN LAKES 



AP&ll 



MAY 



JUNE 



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SEPTEMBER 



OCTOBER 



NOVEMBER 



DEC 



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• 



Pig. 30. — The quantity of organic matter, of crude protein and of ether extract 

 in the nannoplankton of Lake Mendota in 1915. Curve A shows the amount 

 of dry organic matter, curve B the crude protein and curve C the amount 

 of ether extract in milligrams per cubic meter of water. Compare with 

 figure 14. See table 4-1. 



