C ) 
which all true Volatile Salts are, they do prefently 
Ferment aad make great CoUifion with Adds, and there- 
fore am much inclined to make this Inference, That our 
Qyl is not a bare Pahuhm ignis ^ or an unadlive Prin- 
ciple,' but does upon a double account as vveil upon the 
fcore of the incalefccnt Oyi as of the inherent Sale 
confpire with the Compound Spirit to make this great 
Hsat,. Explofion, and Accenfion. 
In the Catalogue of Experiment Sy 
We may farther cbferve, That of the light Effential 
Oyls drawn from Seeds of Vegetables, all cf them do 
make a great Ebullition with an Explofion, but that few 
of them do aSualiy take Fire: And that all of thofe 
that are drawn from Trunks or other Parts of our Ve- 
getables, do certainly rake Fire and Flame. Wherefore 
having obferved that thefe that do not take Fire or 
Flame, did yet make as great an Explofion and Ebul- 
lition, and probably as great a Heat as thofe that did, I 
was apt to impute it to the Lightnefs and too greac Sub* 
tilty and Volatility of thofe Eflential Oyls, whole very 
aftiveParcicles did too foon exhale or fly away. And 
this Conjeftur^ is fomething juftified by the Addition of 
a more Ramous Body, ( which was Balfam of Sulphur 
made with Oyl of Turpentine) to our moft Volatile 
or Subtile Oyls, which then produced a Fkme, whofe 
Particles being more Grafs or Ramous, will detain the 
j more Volatile Oyl from too foon an Explofion, and give 
' more time to the fiery Spirit to penetrate, and mix it 
felf with thofe Combuflible Materials. And this may 
I I beoneReafon why the Ponderous Oyls diftilled from 
the Roots or Ligneous parts of a Plant do all take Fire, 
J j namely, becaufe the parts of this fort of Oyi lying clo- 
i fer.togethev do not fo foon diffipate afcer the Spirit is 
I ■ 
