1J 8 TRAVELS THROUGH 



fherl-ftars. There is too a black fpecies, with -in- 

 clofed white garnet-like fnerl-cryftals*. 



17. Lapilli delVefuvio are fmall bits or fragments 

 of the black flaggilh fefrugineous Java, N i. are 

 thrown out during the eruptions, and appear in 

 large heaps. 



1 8. Sabbione or Rena diVefuvio, the fame lava in 

 grains of the bignefs of fea-fand ; covers Vefuvius 

 towards the fea. 



19. Ceneri neri del Vefuvio are black allies or puz- 

 zolana, common in the inner funnel of Vefuvius, 



* The Iceland-agates, or rather the black vitreous Iceland 

 lavas, in Mr. Bankt's collection, appear in three varieties. 

 . Vitreous black, rough and coarfe to the touch ; con- 

 taining 



K. White fmall Iherl-flakes from the red crater. 

 8. Small white and black fherl flakes, from a Hecla 



Rhaun. 



b. Entirely vitrified black, breaking fcaly as glafs ; now 

 and then 



a. With fingle white fherl-fiakes. A large fragment is 

 very remarkable for containing fome large round 

 air-holes or bladders, incruftated with 

 |S. A white cryftallized fubftance; which, on account of 

 the compact glafs-mafs, cannot be fuppofed to be. 

 cryftallized by water, and appears flrongly ta coun- 

 tenance Mr. Ferrer's hypothecs. 



c . Blackifh tranfparent ; commonly broke or fplit into irre- 

 gular fmall prifms or points, which bear fome refemblance to 

 arrow- fhafts, never containing any Iherl-flakes. 



and 



