J 44 TRAVELS THROUGH 



moft part of the lavas of ancient and modern vol- 

 canos '?, {ticking in them very clofe together ; 

 eafily broke out of their fubftance, and then 

 leaving holes, which are exact impreflions or 

 mouldings of their regular forms ; if broken, there 

 appears in their middle a fmall black-coloured 

 fherl- grain. 



2. Opaque, white, farinaceous, long, round, 

 columnar, and on the furface (triated fherl cryf- 

 tals (in Saxony called ftangen-fpatb or Jlangen- 

 Jherl f), found in fome Vefuvian lavas, and in 

 thofe which are to the right of the road from 

 Naples to Puzzuoh. 



3. Hexagonal whine tranfparent fieri columns, 

 either truncated or pyramidical - 3 in fome Vefuvian 

 lavas ; fcarce. 



4. Black Jherl-featbers, either thin and pin-like, 

 or fomewhat bigger, either round or hexagonal. 



* This is to be understood of Italian volcanos. The Hef- 

 fian lavas, which I have defcribed lately, offer other varieties 

 of fherls j fo too do the Iceland lavas in Mr. Bank's col- 



f This German flone is ele&ric as the Ceylon and Brafilian 

 tourmalines ; and thefe laft in their primitive itate being of 

 the fame form as the itangen-flierl, there is good reafon to 

 rank them among the flierls and the volcanic productions ; 

 to fet right fome Mineralogies, and to roam from the volcanic 

 through the ekdlrical-fyftcms into literary immortality. 



<. Lamel- 



