Temark, that even Sir Charles Lyell while supporting the view 
Indicated above, of the generally eruptive origin of volcanic 
Tates ;—I mean the excavating power of the sea in forming what 
he calls “craters of denudation.” This phrase, I think, he first 
ejected materials over a wider area. And thus, perhaps, we may 
t crateri- 
Many, j 
‘skeleton, like Santorin. Some, like Graham’s Isle, have been 
€ntirely swept away. But the question being as to the origin of 
ese Crateriform hollows, not as to the cause of any subsequent 
tion of figure, this, I believe, may in every Instance, with- 
Out exception, be most reasonably referred to voleanic explosive 
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