1893-94.] THE FLUCTUATIONS OF LAKE ONTARIO. 43 



theory may- be dismissed, so far as regards the apparent effects on lake 

 fluctuations. 



The extreme fluctuations of Lake Erie, or the difference between the 

 records of the highest and lowest water at Port Colborne, between 1859 

 and 1867, were 11 feet 3 inches, and the extreme fluctuations of Lake, 

 Ontario, at Port Dalhousie between 1868 and 1870, were 6 feet ii inches, 

 and according to the records in the Harbour Commissioner's ofiice, 

 Toronto, between 1870 and 1872, were 5 feet 35^ inches, as before ex- 

 plained in reference to the fluctuations of Lake Ontario. Extreme 

 fluctuations on lakes Superior, Michigan, Erie and Ontario have been 

 referred to by newspapers and periodicals in the United States and 

 Canada, but as the fluctuations were not particularly recorded, or ac- 

 curately substantiated by reliable observations, as in the above-mentioned 

 instances at Oswego and Toronto, I have not considered it advisable to 

 give an account of them in this paper. 



