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PHILOSOPHICAL 
TRANSACTIONS, 
XL Experiments m the Phlogiflication of Spirit of Nitre . 
Fy the Rev • Jofeph Prieftley, LL.D. F. i?. & 
Read March 26, 1789. 
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A S the colouring of fpirit of nitre has fome connexion 
with the do&rine of phlogifton, to which I propofe to 
give my beft attention, I have lately refumed my experiments 
on that fubje£t, and beg leave to lay the refult of them before 
the Society. 
In my former experiments, vol. IV. p. 2. I found that the 
colourlefs acid became fmoking, or orange-coloured, and emit- 
ted orange-coloured vapours, on being expofed to heat in long 
glafs tubes, hermetically fealed ; and I then concluded, that 
Vol. LXXIX. X this 
