no 
THE FAIRY-LAND OF SCIENCE. 
tons of water fall over them every minute, making 
magnificent clouds .of spray. 
Fig. 26. 
,- 
Bird's-eye view of Lake Erie, Niagara Falls, and Queenstown. 
(Lyell.) 
Sir Charles Lyell, when he was at Niagara, came 
to the conclusion that, taking one year with another, 
these falls eat back the cliff at the rate of about one 
foot a year, as you can easily imagine they would do, 
when you think with what force the water must dash 
against the bottom of the falls. In this way a deep 
cleft has been cut right back from Queenstown for a 
distance of seven miles, to the place where the falls 
now are. This helps us a little to understand how 
