_j 573.5 



u 

 > 



u 



_i 573.0 



< 



u 

 t/) 



UJ 



> 



O 



< 



UJ 



u 

 u. 



572.5 



572.0 



571.5 



F M A M J 



N 



Fig. 5-/^Terases of monthly mean lake levels at 



Cleveland. Ohio, for the period 1860-1930. 

 Datp taken fron> Table 2. 



34 



