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nla, and returned to Meflina from Catania, 

 I had an opportunity twice to examine, at 

 my leifure, that tra6t of fhore, which, for 

 the fpace of nearly three-and-twenty miles, 

 is volcanic. One third of it, beginning at 

 Catania, and proceeding to Caftello di Jaci, 

 confills of prifms more or lefs charadierized, 

 and fuch as they have been defcribed by 

 M. Dolomieu j but the other two thirds, 

 though equally compofed of lavas with the 

 former, and for the moft part falling per- 

 pendicularly into the fea, have no fuch 

 figure ; and only prefent, here and there, 

 irregular fiflTures and angular pieces, fuch 

 as are, generally, obfervable in all lavas, 

 which feparate m^ore or lefs on their conge-" 

 lation. 



In my circuit by fea round the fhores of 

 Ifchia, I was particularly attentive, as I 

 was every where elfe, to the conformation 

 of the lavas ; and here there feemed a 

 great probability of finding them prifmatic, 

 from the abundance of them which in 

 different dire(^cions and angles fall into 



the 



