( r. ) 



above-mentioned, but larger, and more ap- 

 proaching to a globular figure. It is re- 

 markable that this enamel, in fome places, 

 forms one whole with fome pieces of lava 

 of a horn-ftone bafe, which alfo contains 

 garnets. 



I {hall briefly diftinguifh four fpecies of 

 lava, each of a horn-ftone bafe, which are 

 met with, in detached pieces, on the road to 

 the Stoves. 



The firft has a fibrous fraGure, the colour 

 of iron, fome appearance of porofity, fuiE- 

 cient hardnefs to give fparks with fteel, and 

 the power to move the magnetic needle at 

 the diftance of a line and a quarter. It 

 emits an earthy odour, and contains felt- 

 fpars. 



The fecond is of a black-grey colour, 

 and, though compact, rather foft. Almoft 

 one half of it confiftsof rhomboidal felt- 

 fpars. 



VOL. III. D The 



