INDEX. 363 



2. With parallelepiped merl-fpcit" 1 , an antique fpecies, 

 refembling to fome Tufcan Lavas, called Serpentino 

 nero antico, 224. 



3. With red feld-fpath, from Newmark, 324. 

 III. Green. 



Its fubftance feems to be Trapp. 



See Trapp and paffim. 

 Its bladders and holes filled with flint or white agate 



is an antique fpecies, 12$. 

 Varieties. 



i. With flint and white agate fpots, antique, 225. 

 3. With green fherl, and large white quartz fpots; 



antique, 226. 225. 

 3. With black fherl flakes, 226. 



Porto, Santa Jiorita antica , marble, 218. 

 Porta Santa noti Jiorita^ antica, marble, 218. 

 Porto Venere, marble, yellow and black, 299. 

 Porus, See Tophus calcareous, and Incrujiations. 

 Potftone^ produced by hot wells in Iceland, 57, 58. 

 See Lehs. 



Precious Stones, their difference from volcanic (herl and volcanic 

 vitrifications, 152. 53. 



Pumice Stone, Vefuvian, 159. , 



Contains garnet-like fherls, 130. 162. 

 Puricbiello antico^ marble, 218. 

 Puzznlana, 130. 

 Puz,uolo ; remarks on fome columns in the temple of Scrapis, 



171* 172. 

 Pyrites^ cubical, from Vefuvius and ^tna, 142. 



