94 



PLANKTON OF WISCONSIN LAKES 



Fig. 34. — The amount of dry organic matter in the net plankton, the nanno- 

 plankton and the total plankton of Lake Mendota in 1915. Curve A repre- 

 sents the total plankton, curve B the nannoplankton, and curve C the net 

 plankton. The curves show the number of milligrams per cubic meter of 

 water. 



