( 297 ) 



and perhaps rendered fuch by the filtration 

 of the rains which have infinuated through 

 the fmall fiiTures of the lava. 



In the furnace it changes into an enamel 

 fimilar to that afforded by the other pitch- . 

 Hone lavas, with the liquefadion of the felt- 

 fpars it contains. 



VI. This lava is thus defcribed by the 

 Marchefe Orologio : 



" Near the top of the firfl fummit" (the 

 Monte del Catajo is bifurcated) " there is a 

 ** fpacious irregular plain with many in- 

 " equalities, which I incline to fufpedt was 

 " an ancient crater deftroyed by time, and 

 " filled by the falling in of its fides. We 

 " here find enormous mafles of a fpecies of 

 " breccia, or pudding.flone, compofed of 

 " fmall fragments of many varieties of lava, 

 " united and bound together in a hardened 

 « clay." 



This breccia I carefully examined, and 



confider 



