( 3^5 ) 



the acute obfervatlon of Sir J. Strange and 

 other difcerning naturalifts. It deferves re- 

 mark, likewife, that the trapp has taken a 

 prifmatic configuration at Catajo, in the dry 

 way, and in Sweden in the humid, as has 

 been elfewhere fhown. This may teach 

 us, that we can only determine by local 

 circumftances in which of the two ways 

 bafaltts have been formed. 



Thefe two ways, however, have united 

 in the formation of the hills and mountains 

 of Padua, as appears from the mixture of 

 calcareous carbonates with lavas. This 

 combination, which is not found in the Eo- 

 lian ifles, but is obfervable in the Vicentlne 

 mountains, at Vcfuvius, in the extinguiilied 

 volcanos of the Val di Noto in Sicily, in 

 thofe of Portugal, and Germany near Old- 

 Brifach, and probably in other volcanized 

 mountains, fhould incite the naturalift to 

 enquire which of thefe two contrary agents 

 was prior in point of time. I (hall not enter 

 into this queftion, which indeed appears 

 to be precluded by the obfervations of the 



Abbe 



