( 267 ) 



ij black enamel, of the greateft compa(3:- 

 nefs, fcattered over with white points, which 

 are feltfpars not entirely vitrified. The 

 magnetic needle is fenfible to thefe fhoerls 

 at the diftance of one line and four- fifths. 



The fecond product, which is from Mon- 

 te Merlo, confifts of an aggregate of ex- 

 tremely w^iite and fliining half-cryfiallized 

 feltfpars, of a changeable colour, which in 

 the furnace produce a white, and fpungy, 

 but hard glafs. 



The third, which is from the fame moun- 

 tain, at firfl view, might be taken for a pu- 

 mice, as it fwims in water ; but, when pro- 

 perly examined, appears to be a vitreous 

 fcoria, in the folid parts fufficiently hard to 

 give iparks with fteel ; i reflated and rendered 

 fpungy by the adion of fire, and aeriform 

 fubftances. The furnace perfedly vitrifies 

 it. 



Two other produds, one from Mafcabo, 

 near Pragtia, the other from Tramonte, 



were 



