INDEX. 373 



Spar (Sberl). SeeSkerl. 



Sponge, fuppofed petrified, 80, 81. 



Stan?e, (Prof.) at Wurzburg. 



> ^ \ t> 



His hypothefis on Serpentine- ilone, 276. 

 Statuario antico, marble, 218. 

 Steatites, green, 243. 

 SteUanti (Glov. Ant.) at Piftoja, 267. 

 Stockworck ; rock, entirely metallic, 294. 



Strata, their oblique fituation and dipping produced by volca- 

 nic eruptions and earthquakes, 51. 

 Stromlolo, a volcanic Ifland, 135. 



Sulphur (native), 



Jn columnar cryftals, 249. 

 In cubic cryftals, 248. 

 Inclofed in Gypfurh, 70. 

 Ciyftallized on Antimony, 2^0. 

 At Tortona, 311. 

 Sublimated by volcanic fire, 64. 

 . i u ' in the Solfatara, 169. 

 From Vefuvius, ICQ. 



3V 



Sulphureous acid. 



r 



Of the Solfatara, changes Lava into clay, 165. 

 _ . . , 



Produces Allum, 165. 67. 



Vitriol, 165. 169. 



Salmiac, 170. 



. Selenite, 165. 169. 



Reftores the former vifcidity to burn clay, 167. 



Changes Lava into Clay, 236. 



Produces the Allum ore at Tolfa, 209. 



B b 3 Valcou* 







