( 196 ) 



defcribed the qualities and nature of tliefeJ 

 pi'ifms. In Chap. XVII 1 have particular- 

 ly defcribed the literal lavas of Felicuda, 

 which, near the water, are prifmatic. 



It is therefore evident, thatj in thefe two 

 fituations, the origin of the bafaltes there 

 found cannot be what it has been aflumed, 

 generally, by Werner and ether Germans, 

 but that it is truly volcanic. It confe- 



o 



quently appears that Nature obtains the 

 fame effed by two different ways. In the 

 fofhl kingdom, one of her grand operations 

 is cryftallization ; which, though it be mofl 

 frequently effected in the humid way, is 

 fometimes produced in the dry ; as we fee, 

 among other inftances, in iron, which Na- 

 ture cryftallizes within the earth, both by 

 the means of water and of fire, in which 

 latter way the beautiful fpecular iron of 

 Stromboli is produced *. Nor are there 

 wanting other inftances, of the cryftalliza- 

 tion of the fame metal by the adion of fire. 



* See Chap. XI. 



And 



