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fuppofed, and, indeed, proved, the beautiful 

 quartzofe ftones to be formed in certain 

 lavas on the fhores of Lipari, not far from 

 Vulcano. The zeolites now defcribed, like- 

 wife, afford a proof in favour of this opi- 

 nion, thofe, efpecially, the prifmatic cryftals 

 of which have for their bafe the fides of 

 cavities in the lavas* 



I fhall conclude thefe obfervations rela- 

 tive to zeolites, v/ith the following enquiry- 

 concerning an hypothefis adopted by M. 

 Dolomieu. 



That naturalift was of opinion that the 

 zeolites of volcanized countries are onlv 

 found in thofe fituations which have beea 

 covered by the v/aters of the fea; and the 

 arguments he adduces to prove this, appear 

 to me fufficiently convincing with refped: 

 to the multiform zeolites obferved by him. 

 But what fhall we fay of thofe we have now 

 defcribed ? I certainly did not negledl to 

 make the moft accurate refearches on the 

 fpot. It has been already faid that thefe 



ftones 



