tions which have a diredt and immediate 

 relation to the deflagrations of the Eolian 

 illes. 



We have already obferved and defcribed 

 thefe iflands from the fammit to the bafe, 

 which buries itfelf in the waters of the 

 fea. But it was impofiible to examine 

 their internal part in the fame manner as 

 the external ; though the importance of 

 fuch an examination merited that every ef- 

 fort in our power (hould be exerted to ef- 

 fed it. It would be equally interefting and 

 initructive to afcertain the nature of the 

 bottom in thole tra-ilis of fea which fur- 

 round thefe illands, and feparate them one 

 from the other. 1 iball, therefore, here 

 relate whit I obferved with refped to this 

 fubject, and defcribe the methods and inftru^ 

 ments to which I had recourfe to make my 

 obfervations. 



Where the depth was not great, I found 

 extremely ufeful the large tongs, mentioned 



by 



