■Ave .sefT ocr 



WM 



mux 



Mil 



numnmr 



^^rrmTTnT^lTT T nT TT 



Fig. 32.— Diagram showing the numerical results obtained for the various 

 organisms in the nannoplankton of Lake Mendota in 1915. The different 

 forms are indicated in the explanation on page 91. Compare with figure 25. 



