( ^85 ) 



The porofity of volcanic rocks Is, therefore, 

 a decilive proof that they were once in a 

 fluid ftate. Several of the Euganean rocks 

 are porous and cellular, as I have already 

 fhown of more than one, and fhall proceed 

 to fhow of fome others. 



There is a declivity on one of the Euga^ 

 nean mountains, the name of which I can- 

 not give, having negled:ed to note it in my 

 journal, an omiffion of little importance to 

 the truth of the fa£t ; which declivity is 

 compofed of a rock with a horn-ftone bafe, 

 containing fekfp^thofe cryftals, and full, 

 both on the furface and in the internal 

 parts, of round vacuities, fu cb, preclfely, 

 as are ufuaily produced in lavas by aeriform 

 fluids, 



I fhall make a few more obfervations on 

 the Euganean lavas ; and (hall notice that 

 one of them containing bubbles, and that 

 in a confiderable number, is found in im- 

 menfe quantirits in, and on the fide of, the 

 road leading from Eajamoate to Rua, 

 2 This 



