( 98 ) 



it are contained various grains of amorphous 

 fbltfpar, and a greater number of fmall, 

 long, rhomboidal fhoerls. 



The product of this lava in the furnace is 

 a hard enamel, of the colour of pitch, and 

 full of bubbles. The feltfpars it contains 

 remain refradtory. It is to be remarked, 

 that this enamel does not lofe the magnetic 

 virtue. 



The place where this rock hangs over 

 the fea is called Fila di Sacca. Beyond it 

 the fhore of the ifland, M^hich continues to 

 have a fteep defcent into the fea, offers only 

 common lavas, except one fpecies which 

 has fome rude appearance of prifms, that 

 affume a more diftin(^ form near the furface 

 of the water. 



Still farther, at a place called Saccagne^ a 

 number of fmall rocks rife above the furface 

 of the water; one of which is called // 

 Perciato^ becaufe it is perforated in the mid- 

 dle, and the opening is wide enough to 



admit 



