40 



35 



30 



«> 



-~ 25 



a 

 E 

 o 

 to 



E 20 



o 



o 



E 



2 



/5 



iO 



30 35 40 45 50 55 60 



Length of Clams in Millimeters 



65 



75 



FlE- h. S17.8 distribution of 6U0 clama fron test plot Uay 6 191,9 - 

 before experiment. Data eaioothed by novlng average'of 310. 



