Pitch- ftone lava of Monte Sieva in beau- 

 tiful and v^ell preferved pieces, 



Silex - - . y^^ 



Alumina - - - 14 



Lime - - - g 



Iron ' ' - 3i 



Pitch-ftone lava of the fame Monte Sieva, 

 ferving as a cement or bafe to the above 

 pieces, 



Silex - ... 68f 



Alumine - - - 19 



Lime - - - 8 



Iron - - - 2 



When thefe three analyfes of mine of 



the volcanic pitch- ftones of the Paduan 



mountains are compared with thofe of 



Bergmann, Wiegleb, and Gmelin, we fhall 



S 2 ' find 



