( 'H ) 



C H A R XVIII. 



A L I C U D A. 



Danger to 'which the author *was exfwjcd^ in 

 a teiv.pejl^ on his pajfage from Fd'icuda to 

 Alicuda — Pumices and glajfes found in the 

 latter if and — Examination of the coof of 

 Alicuda — Several rocks formed of detached 

 globes of lava — Enquiries relative to the 

 origin of thefe globes - Confrmation of the 

 uncertainty of a?iy opinions formed relative 

 to the greater cr lefs antiquity of lavaSy 

 from the more or Icfs fenfible decompofition 

 they may have undergone —Ifolated mafes 

 of porphyry^ which exhibit no fgns of 

 having been attacked by volcanic fre — - 

 Lavas of another kind — Shoerls of a 

 greenifh blue colour contained in all thefe 

 lavas — T'he coaf of Alicuda more rugged 

 and threatening than that of any other 

 of the Eolian ifes — No mouth of any 

 ancient crater in the fides of the if and 



