( ^35 ) 



manner as we find ftones rounded in rivers. 

 In the courfe of this work I have adduced 

 feveral examples of this kind, even among 

 the glalTes and enamels of Lipari, which 

 have taken a globofe figure. But a more 

 careful examination of thefe globes com- 

 pelled me to change my opinion, on con- 

 fidering that the pieces of lava that have ac- 

 quired an orbicular form from the agitation 

 of the waters, are always more or lefs 

 fmooth on their furface ; whereas thefe were 

 rough all round — though their roughnefs, 

 £onfifting in general of minute parts and 

 points, mufl have been worn away by rub- 

 bing againft anyobftacle. I obferved, befides^ 

 that thefe globes, in many places, had a 

 (hinlng and fcoriaceous appearance, extreme- 

 ly fimilar to that of the pieces of lava inceC- 

 iantly thrown out by the volcano of Strom- 

 boli. I am therefore rather of opinion that 

 they are pieces of lava that have beem 

 thrown out from a volcano in Alicuda, and 

 taken a fpherical form in the air, from their 

 great foftnefs, as fimilar phenomena may be 

 K 4 obferved 



