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veral defcrlptions, which I fhall here briefly 

 give the reader, only making fuch altera- 

 tions as appear to be necefTary. 



T. Is one of the fineft lavas of the Eu« 

 ganean mountains. Its bafe is feltfpar in 

 the mafs, but it is with difficulty recog- 

 nized from its exterior charad:ers, the fire 

 having changed it into a vitreous lava. It 

 is of a cinereous colour, compafl:, but not 

 very hard, on account of its numerous fif- 

 fures* It contains cryfcallized micas and 

 feltfpars ; and the enamel it produces in 

 the furnace, fimilar to that of the pitch- 

 ftone lavas, forms one homogeneous mafs 

 with the fufed micas and feltfpars. 



This lava, on which the noble palace of 

 the Marchefe degli Obizzi is built, occupies 

 an extenfive tra<St of the fides of Catajo, 

 to the fouth ; and branches off, likewife, 

 to the north-eaft ; though, from its being 

 there in a ftate of the greateft decompofi- 

 tion, it has loft the characters of a vitreous 

 lava, and taken thofe of an earthy and 

 U 3 pulverulent. 



