IP 14 



BOUND 

 CO^PPM 



GREtN 



algae: 



% algae: 



SPECIES 



10 



00 



Figure 5. Diagram showing the percentages of hard and soft water drainage 

 lakes in a random sample of 100 Wisconsin lakes; their boxmd carbon dioxide 

 content (expressed in parts per million); and the percentages of green and 

 blue-green algal species in their total algal flora. ( See discussion in text. ) 



[31] 



