( '74 ) 



on the north and north-eaft fide abounds in 

 pumices, enamels, and glafles. The vitre- 

 ous fubftances,- therefore, of this ifland, and 

 thofe of Lipari, which, as has been faid, oc- 

 cupy about two-thirds of the latter, compofe 

 an accumulation of glafs, not lefs than fif- 

 teen miles in circuit. It is impofTible to at- 

 tend to this flupendous phenomenon with- 

 out feeling our curiofity excited to know 

 whether it be peculiar to thefe iflands, or 

 found likewife in other volcanized countries. 

 But fatisfa£loriIy to anfwer fuch a queftion, 

 it would be requifite that we fhould be ac- 

 quainted with the volcanic mineralogy of 

 all the volcanos in the world ; not only thofe 

 at prefent burning, but thofe extinguiilied, 

 which are infinitely more numerous ; in the 

 fame manner as we are with that of Viva- 

 rais and Velay, the iflands of Ponza, Vefu- 

 vius, Etna, the Eolian ifles, and the moun- 

 tains of Old-Brifach, by the labours of Fau- 

 jas, Gioeni, Dolomieu, Dietrich, and myfelf. 

 Of fuch a mineralogy, how^ever, we are 

 entirely deftitute. The greater part of thofe 

 who, either by chance, or from curiofity, 

 ~ - have 



