CLIMATE OF THE LAKE REGION: 



Z77 



appears another strongly marked period of excess, culminating in 1855. 

 Again, between these three maxima are two lesser extremes, culminat- 

 ing in 1844 and 1868, Thus our curved line marks five periods of 

 maximum rainfall. 



Of low extremes we note four, which have their culminations in 

 the years 1839, 1850, 1860, and 1872. 



The intervals between extremes vary from eight to fourteen years, 

 the general mean being eleven years. 



Let us now compare with these curves those immediately below, 

 and which represent the periodic changes in the levels of Lake Erie 

 during the half-century. 



