3S^ BSSAYS AND OBSERVATIONS 



I put two ounces and a half of this fac- 

 titious nitre Into a fmall glafs retort, and 

 poured upon it one ounce of oil of vitriol, 

 which immediately begun to raife an e- 

 bullition with heat and red fumes ; a re- 

 ceiver was inrtantly joined to the retort 

 with pafte, the glafs fet in a fand fur- 

 nace, and the fire increafed gradually. 

 After the operation, there was found in 

 the receiver, a fmoaking acid liquor, ot 

 an orange colour, which weighed one 

 ounce, two drams, three grains : There 

 remained at the bottom of the retort a 

 cake of white folid fait, which being dif- 

 folved in warm, water, the folution' filter- 

 ed, and part of the water again exhaled, 

 fliot into cbryftals ; and thefe being all 

 carefully collected, weighed two ounpes, 

 twenty two grains. 



Thf fpirit obtained in this manner was 

 fiery, a(!ilive, and conftantly emitting red 

 fum.es ; it diiTulved filver, kindled with 

 oil of cloves, and agreed in all o:her cha~ 

 rapiers with fiirong fpirit of nitre* The 

 • fait which remained in the retort when 

 purified and chryftallized, no way refeni- 



bled 



