ITALY. LETTER V. $1 



4. Of the ancient VOLCANOS 5 

 their Effeffs and Productions. 



Their eruptions from under ground of the 

 flate, and perhaps from a liill greater depth, are 

 evidenced at Rccoaro ; where you may fee in the 

 flate a great number of oblique fifiures filled with 

 lava. Thefe fiflures and clefts have been undoubt- 

 edly produced by earthquakes^ whofe eoncufiions 

 and explofions have produced fo many diforders in 

 the beds of the fuperior calcareous mountains 

 (mont. fecundarii) and hills (mont. tert.) To them 

 is owing the dipping oblique fituation of fo many 

 mountain-beds ; which moft part, and originally, 

 had been precipitated by water into an horizontal 

 pofition. Thus the fcaglia and the upper beds of 

 the calcareous hills are obliquely incumbent on 

 the fides of the Euganean-hills. The lavas have 

 not only filled up the open fiflures and clefts of 

 the calcareous hills, produced by their drying or 

 earthquakes ; but they have likewife inferted and 

 forced themfelves between their ftrata, which they 

 have feparated and lifted up *, as frequently may 

 be feen in the Voile Polifella in the Veronefe dif- 

 trid, and in many other places. Floods and 



* The fame has been difcovered by Mr. Wl:teburft, in Dei> 

 bylhire, 



JE 2 inun- 



