144 ILLINOIS BIOLOGICAL MONOGRAPHS [144 



EXPLANATION OF PLATE XIV 

 Fig. 21. Showing the relationship existing between ciscos from Pine and Oconomowoc lakes. 



The age in years is plotted against the weight in grams. Pine lake has many times more 



ciscos per volume than has Oconomowoc lake. 

 Fig. 22. Showing the relationship existing between ciscos from Pine and Oconomowoc lakes. 



The age in years is plotted against the length in centimeters. 



