PLANKTON OF LAKES WAUBESA AND KEGONSA 125 



6000 



5600 



S200 



4600 



4400 



4000 



3600 



3200 



2dOO 



2400 



£COO 



/GOO 



I200 



eoo 



*oo 



S 



■- — s 



Fig. 39. — The quantity of dry organic matter in the net plankton, in the nanno- 

 plankton and in the total plankton of Lake Waubesa in 1916. Curve A 

 represents the net plankton, curve B the nannoplankton and curve C the 

 total plankton. The amounts are indicated in milligrams per cubic meter 

 of water. See tables 47 and 48. 



