42 TRAVELS THROUGH 



varioufly coloured flints. It caps the Alps on their 

 furface, 'dips under the Mantes tertlarios Bericcs, 

 and rifes again on the other fide up to the volcanic 

 hills, on whofe doping fides it is fuperincumbent, 

 having been by their eruptions firfl raifed and 

 elevated, and then perrupted or broken. This 

 Scaglia does not every where appear on the fur- 

 face of the Alps, being deftroyed in many places 

 by time and weather, and is found and unaffected 

 only in fmall holes and vallies. Mr. Arduini has 

 found in the Scaglia in Monte di S. Pancrazio red 

 flints branching as corals ; and in the Scaglia 

 fbperincumbent on the fides of volcanic hills near 

 Padua rife fulphureous hot wells fputizze.} 



Thefe feveral ftrata of the Alps have been 

 formed by nature generally in an horizontal pofi- 

 tion ; but, having fuffered many devaluations by 

 earthquakes and volcanic eruptions, as fplitting 

 them into large fifiures and cracks, through 

 which the lavas forced their way and occafioned 

 funnels and craters ; they have been much difor- 

 ckred, which makes them appear at prefent funk 

 in fome places, raifed in others, and brought from 

 their original level to a dipping, oblique, or even 

 vertical pofition. In fome places they are wholly 

 overturned. Inundations and rivers, whofe channels 

 and courfe might be fuppofed to have been very 

 often changed by earthquakes, have likewife caufe|l 



in 



