JOURNAL. 



J^ATURAL PHILOSOPHY, CHEMISTRY, 



AND 



THE ARTS. "^ 



AUGUST^ 1808» ] 



ARTICLE I. 



Ohseh;aHons on the crystallized Substances included in Lavixsi 

 by G. A, Deluc. 



(Concluded from p. 188.y 



JjjVEllY thing in volcanoes indicates, that the depth 

 of their foci is immense." These are the words of Mr. 

 Fleuriau de Bellevue, and he adds, ** This is the opinion of 

 Mr. DeliiC and several naturalists." 



I have said, and I believe, that the foci of the volcanoes Fociof tolc*. 

 are at very great depths, contrary to the opinion of those noes very deep, 

 tiaturalists, who imagine the foci to be very near the base of 

 the volcano, and even place them in the cone, that rises 

 above thie ground : an opinion so repugnant to all the phe- 

 nomena, that I cannot conceive how it could enter into any 

 one's head. I do not think however, that I have used the but not of an 

 word immiense, which would imply a depth below the reach ""i^^^se 

 of conjecture, and this is far from my idea. A league per- 

 pendicular is a very great depth, and I do not suppose the 

 foci of volcanoes can be much deeper; but every thing in- 

 dicates, that they have ramifications. The fragments of Ramify among 

 natural rock they throw out can come only from these late- t^es^rat^* 



Vol. XX. No. 89— Aug. 1808. R ^lal 



