[ 34 ] 
its effedls to that of the Grotto del Cane, as I have 
often experienced. 
The form of the little ifland of Nifida diews 
plainly its origin. It is half a hollow cone of a vol- 
cano cut perpendicularly; the half crater forms a little 
harbour called the Porto Pavone; I fuppofe the other 
half of the cone to have been detached into the fea 
by earthquakes, or perhaps by the violence of the 
waves, as the part that is wanting is the fide next to 
the open fea. 
The fertile and pleafant ifland of Prccita fhews 
alfo mod: evident figns of its produdlion by explofion, 
the nature of its foil being diredly fimilar to that of 
Bai'a and Puzzole ; this ifland feems really, as was 
imagined by the ancients, to have been detached from 
the neighbouring ifland of Ifchia. 
There is no fpot, I believe, that could afford a 
more ample field for curious obfervations, than the 
ifland of Ifchia, called Enaria, Inarime, and Pithe- 
cufa, by the ancients. I have vifited it three times; 
and this fummer paffed three weeks there, during 
which time, I examined, with attention, every part 
of it. Ifchia is eighteen miles in circumference : the 
whole of its foil is the fame as that near Vefuvius,. 
Naples, and Puzzole. There are numberlefs fprings,, 
hot, warm, and cold, difperfed over the whole 
ifland, the waters of which are impregnated with 
minerals of various forts ; fo that, if you give credit to- 
the inhabitants of the country, there is no diforder 
but what finds its remedy here. In the hot months 
(the feafon for making ufe of thefe baths), thofe who- 
have occafion for them flock hither from Naples. 
A cliari- 
