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The blow-pipe prefently melts this third 

 fpecies, and with ebullition ; a phofphoref- 

 cence precedes the fufion, and the pearly 

 globule which is the refult, is a femitranf- 

 parent glafs, abounding in bubbles. If this 

 globule be broken, which requires rather a 

 fmart blow, the fharp angles of the frag- 

 ments will cut deep into glafs. 



This zeolite, foon after it has been put 

 into acids, attaches to the fides of the con- 

 taining vefTel in the form of a cruft, which 

 cruft prefently refolves itfelf into a tranfpa- 

 rent tremulous jelly, fimilar to that of harti^ 

 horn. 



Fourth fpecies. The lava which contains 

 this zeolite is of a horn-ftone bafe, and forms 

 two fpecies, at leaft two varieties ; the one 

 of which is granular, rough to the touch, 

 and extremely friable ; the other has a kind 

 of foftnefs, a fine grain, and greater folidity. 

 In colour, however, which is a grey, and in 

 their argillaceous odour, both thefe varieties 



agree. 



