6 Bulletin of Laboratories of Denison University [Voi. xi. 
the second lake in Kanawha ; so this additional amount of water 
was also to be disposed of. Consequently it would require only 
a short time for the resulting lake to find its way up Kinnicon- 
nick creek to the mouth of Cabin creek, or to the col separat- 
ing those two streams, break over into Cabin, fill that valley 
and then rush over the divide between it and Limestone creek 
and follow the latter to its junction with Licking at the point 
(B), north to Hamilton, thence out Sugar creek. 
In the course of time the steadily encroaching glacier cov- 
ered the country about Hamilton ; and for the third time a lake 
was formed. Both Kanawha and Licking were now shut off ; 
their waters rose over the col at (D), and pushing through the 
narrow valley beyond, made their way out to Laughery creek at 
either (E) or (F), or possibly in both directions for a time ; for 
even had the original point of discharge for this ravine been at 
(E) the glacial floods would by this time have torn a way 
through and thus established the present course of the Great 
Miami. 
Still a fourth time was Kanawha to have its outlet shut off 
and its rapid current converted into a tranquil lake. The gla- 
cier came to the hills around Cincinnati ; when this happened 
the old mouth of Limestone at (B) was obliterated, and Kana- 
wha was compelled to make a new course for itself by tearing 
out the col at (C). Joining Licking again, the two followed 
their last channel as far as North Bend, and probably out to 
(F) ; but there is a possibility that before the col at (C) was 
removed the ice had advanced far enough to reach the hills south 
of (F). In this case the new lake would have included Lick- 
ing valley and risen to the level of the col at (G) before it could 
have begun to drain off. 
Note. — How many intervening cols were broken through by the Monon- 
gahela in its passage to Kanawha, or how many lakes and lakelets were succes- 
sively formed and drained, can not yet be told ; but to judge from the numerous 
sharp bends in that part of the Ohio, they must have been frequent. This is a 
factor to be taken into consideration, in studying the terraces of the upper Ohio 
and its branches. 
