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iiace. They were, in the whole, nine : 

 three from the ifle of Elba ; one clneritious 

 and almofi: opake ; the fecond femitranfpa- 

 rent and yellowiih ; and the third opake 

 and inclining to black : three from Germa- 

 ny ; the firft yellow, the fecond red, the 

 third blacik, and all opake : the three laft from 

 the Pyrenees ; one reddifh, the other green, 

 and the third of a colour between a green 

 and a pale blue ; and all three fomewhat 

 tranfparent in the angles. The firft fix, 

 after having continued forty-eight hours in 

 the furnace, fhewed no fign of liquefac- 

 tion ; but only became white, extreiiiely 

 light, and pulverable under the finger. 

 Thofe of the Pyrenees were changed into a 

 beautiful white enamel, giving fparks with 

 fteel, and full of minute bubbles. The 

 pitch-ftones of Saxony, which are found 

 in places not volcanic, are eafily fuHble in a 

 not very ftrong fire, as Delametherie has 

 obferved. 



Several analyfes have been made of 



pech-ftein or pitch-ftones. In one, Berg* 



VOL. III. S mann 



