MODE III. BASALTIN. 



not have undergone the action of fire without 

 being changed*. 



" 8. It is true, that according to the experi- 

 ments of sir James Hall, and some late ob- 

 servations made upon burning volcanoes, it is 

 known that rocky substances may, after fusion, 

 reassume their stony character; but when this 

 takes place in burning volcanoes, there are al- 

 ways found in the vicinity substances which 

 have not experienced this effect, and which on 

 the contrary are scorified or vitrified; which 

 denotes the action of fire. 



" 9. In different countries, and especially in 

 Bohemia and the Vicentine, beds of basalt have 

 been observed, which alternate with grit, or stra- 

 tiform limestone : does not this reunion of these 

 two rocks prove that they have had the same 

 origin ? The Vulcanists, to make this agree with 

 their theory, are obliged to have recourse to 

 quite a forced supposition, according to which 

 there have been alternately volcanic eruptions 

 and submarine deposits; whereas this alternation 

 of beds of different rocks, of nearly contemporary 

 formation, has more than one example in moun- 

 tains. 



" 10. There are many basaltic regions where 



" * The same observation as in note upon article 5." 



