C 757 ) 
Having therefore thought that the Salt Particles 
which were raifed up by the force of the Fire, muft 
neceffarily be of a Spherical Figure, as being foftned and 
melted by the Heat, I was willing to be fatisfy'd herein • 
and remembring fome Remarks I had formerly made on 
Gun-powder, I took feveral clean Glaft Vials from 3 
to 6 Inches long, thefe I heated to dry them, and ra- 
rify the Air, and then put therein one or more of the 
largeft Corns of Gunpowder, and clofed them up to ex- 
clude the common Air, and placed them in fo great a 
Heat that the Powder took Fire, filling the Glals with 
a white Smoak, (bme of the Cole and Brimftone flick- 
ing to the fides; but putting in more Corns, they 
were carried up much higher, lb that I could very di- 
ftin&ly difcern the Brimftone from the Nitre $ for it 
lay fo thick in fome places, as to exhibit a yellow co- 
lour, and might, by a good Microfcope be feen moving 
circularly in the white Smoak, which was the Nitre ; 
tho the Particles thereof were very final!, which, when 
moving, appeared perfect Spheres, which leifu rely fub- 
fided to the bottom of the Glafs : Wherefore I laid the 
Glals along, that the Particles of the. Nitre might be di- 
ftindt from thofe of the Coal and Brimftone ; and then I 
found thofe Particles which before fcemed Globular, 
were, when fixed on the fides of the Glafs, all fliot in- 
to fix-fided Salts. Some were like N°. 3. M. N. with 
others irregular as 0, and fome of thefe ended pyra- 
midally like little Diamonds. Some of the Salt-peter 
Particles which lay mixt with the others were long and 
flender, and looked like Iktle bundles of Arrows. 
Befides the forementioned parts, I obferved a Moi- 
fture in the upper part of the Glafs upon the firft fi- 
ring of the Powder, which! guels'd might come from 
the Nitre, and therefore lhall call it Oyl of Nitre, tho ? 
poftibly there might be fome Gyl of Sulphur- mixt 
therewith ; for further Satisfaction I put iome refined 
Nitre 
