76 
The Ohio Naturalist. 
[Vol. IV, No. 4 , 
small trees growing on their upper surfaces. One large mass has 
lodged in mid-stream, and from its resemblance is called “Steam- 
boat rock.’’ 
About three miles downstream a softer ridge (Clinton) is 
encountered, whereupon the valley becomes broader and the cliffs 
disappear for the most part. About a mile further down, the 
river pa.sses through a still softer rock (Cincinnati limestones 
and shales). As a result the valley becomes ver\" capacious, 
being one-fourth to oue-half a mile wide. 
Fig. I. Looking down the Gorge towards the site of tlie old Woolen Mill, 
just above the Waterfall. 
The slope of the river bed in the gorge was found to be about 
35 feet to the mile. It is hardlv necessary to add that this pro- 
duces au abundant water jiower. Fifty years ago not much of 
this power was allowed to go to waste. In 1855 there were in 
the gorge alone five grist mills, one paper mill, one woolen mill, 
one saw mill and three distilleries. But as time went on these 
enterprises, one by one, were abandoned, until at the present time 
only two grist mills are left. The only reason that can be given 
