?2 pf ttlmitith 



EX PER. II. 



SEcondly, by mixing two fuch li- 

 quid feodies as Petroleum and 

 ftrong Spirit of Nitre in a certain 

 proportion, and then diftilling them 

 till there remained a dry mafsi, I ob- 

 tained a brittle fubftance as black as 

 Jet 5 and whofe Superficies (where 

 it was contiguous to the Retort) was 

 gloffie like that Mineral when po- 

 liced 5 and as I expe&ed I found it 

 alfo to referable Jet 5 in being en-' 

 dowed with an Ele&rical Faculty. 



EX PER. III. 



THirdly, Having burnt Antimo- 

 ny to afhes^and of thofe affaes, 

 without any addition, made a trans- 

 parent Glafs s I found 5 that, when 

 rubb'd 5 asEleftrical Bodies ought to 

 be to excite them, it anfwer'dmyex- 

 peftation 5 by manifefting a not incon- 

 siderable Ek&ricity. And this is the 

 worthier of notice, becaufe, that as a 



Vitrum 



