I,YKI,L — I 
OX CRATERS OF Hl,EV,\TION. 
This pai't first enters into the origiTi of tlie Val del Bove, and how 
it is due to aqueous erosion. 
The origin of that large cratcriform valley has been sometimes 
attributed to a sudden catastrophe connected with those movements 
which are supposed to have given rise to the mountain itself ; but if 
the doctrine of a double axis be admitted, and the reasoning advanced 
in this paper be conceded, it is certain we must come " to the con- 
clusion that the mountain, with its lavas and tuffs sloping away from 
