( 1^5 ) 



tliefe prifmatlc lavas, which occupy a con* 

 Tiderable part of the fhore of the i{land> 

 with the following remarks : 



Fir ft. Thefe prifms have never more than 

 three faces, one of which always remains 

 adherent to the lava. 



Secondly. Their diredion is never ob- 

 lique, or tranfverfe ; but, without excep- 

 tion, perpendicular to the fea. 



Thirdly. They are not articulated, as 

 they have been obferved to be in fome 

 volcanic countries, efpecially on Mount 

 Etna, but form one continued line. 



Fourthly. In their lower extremity they 

 defcend within the water, and, in their 

 upper, rife fome feet above the level of the 



f£4* 



Fifihly. Thefe prifmatic lavas have for 

 their bafe, either the horn-ftone or flioerl in 

 the mafs, 



I ihall 



