308 DOMAIN XII. VOLCANIC. 



but are bent as if to cover a convex sur- 

 face. On the east of Etna, the rock of 

 the Cj'clops, here also engraved, presents 

 on its east side beautiful columns of prime- 

 val lava, disposed in the form of an organ, 

 like the Organ Rock near the giants' causey. 

 Near the castle of Aci, the ancient Acis, 

 are found masses of lava in balls, with con- 

 centric layers, eight or ten inches in dia- 

 meter, involved in a bed of bluish volcanic 

 glass. The superincumbent limestone has 

 infiltrated and crystallised in the little ca- 

 vities of the glass. A reddish baked clay 

 also appears, and little prisms of lava about 

 two inches in length. In the neighbour- 

 hood volcanic balls are also found in tufa, 

 with fragments of lava, glass, drosses, and 

 sand. They are generally about six inches 

 in diameter, and often break into regular 

 pyramids, which are joined in the centre as 

 in balls of pyrites ; which, he might have 

 added, marks the same influence of iron*. 

 NO modem Q ur learned author totally denies, even 



lava prismatic. 



* P. 95, 116, 123, 135, 137. 



