INDEX. .. 5$ 3 



JLa<va 



13. With green cryfolite-like hard vitrifications, from 

 Vefuvius, 156. and from monit Catajo^ i. 



14. With yellow vitrifications, from Vefuvius, 156, 

 H. Grey. 



Compact and porous, rough and fandy to the touch, 



refembliiig fome fpecies of Granite, 156* 268. 

 In the Euganean hills, 17. 



1. With black hexagonal fherl prifms, from Veu- 

 vius, 156. 



2. With black fherl lamellae, from Vefuvius, 137, 

 156. 



3. With white garnet-like fherl, 157. 



4. With rifled fherl columns or cylinders, from Ve- 

 fuvius, 157. 



5. With black fherl points, from monte Catajo, i_j. 

 IIL White and wbitf/h. 



In the Euganean hills, 17. 

 On Vefuvius, 156. 

 IV. Red, compafl, and porous. 

 In the Euganean- hills, 17. 



1. With white fherl garnets like porphyry* 3-21-, 



324* 



From Vefuvius, 157. 

 From Bergamo, 321. 



2. With rifled fherl cylinders or Stangen-fherl, from 

 Vefuvius, i 7. 



3. With white fherl flakes, from Vefuvius, 157. 



All thefe red varieties much refembiing porphyry , 

 157. and feem to prove that porphyry is a fpe- 

 cies of Lava, 222. 22-6. for porphyry, or the 

 compact red Lava, has a tendency to cryitallize 

 A a M 



