( 102 ) 
'tis produced in the Earth; What the Air coRtributes to its 
generation, and whattheJE/^r/i^ic felf; Which laft heefteeras 
CO be made up of a Fixt Salt and Sulphur clofefy combin*d,and 
to contain the Seeds of Fixt Salts,even when el ixiviated; which 
Seeds, Se faith, are by an Aerial influx and ferment in traft of 
time digefted and matur d into a Fixt Salt. 
Having deliver'd rhe conftitutive Principles of Niter in ge- 
neral, the Author treats in particular of the Mid spirit of Ni- 
ter, affirming it tobe ptoduced partly by the Air, and partly 
by a Terreftnal matter. Where he refers the Reader to thofe 
Boylean Experiments which make it 
r;j::S'!*!.67f " out, that the Air fu nifh's fomething 
London; he firji ef which that is nccefTary to make a Flame: 
c.r^^an^s New Experiments ^j^-^^^ done,he teaches, that in Niter 
touching ihe Relation be- , r \ i 1 • i r , 
tween Flame and Air, and there do reiide IgneoPts f articles of the 
about Explofions i rjc/^cre, ^\^^ which couiHtute its moft afli ve 
'ZtZJEffiZy 'ofThe'Z part, and by which the flame of kind- 
inLbe'produfiionoffUme e^ led Niter is produced , without any 
venv,itho»^a.y ^ffyfi^' Sulphur, which fubftance he will noc 
min^ or buYning body: and _ S, i • • r i - ^t- 
rvhcre alfo the Curious Reader at all admit tO be tOUUd in pUi e Niter, 
will meet with a full ctndve. being of opinion,thac the deflapjration 
ry i^ftruElive account oj- thofe rvT • J i. oil 
Experiments, whtchthis Au^ of Niter IS made,noc by any Sulphure- 
thorhtreginnct%at, Qus parts of its owd/of which he faith 
it has none,) but by thofe Fiery Aerial parts, put into a very 
quick motion. Concluding upon the whole matter, that the 
Aerial parts of Niter are nothing elfe but the Igneo aerial par- 
ticles thereof, require to make Flame,and that this Aerial part 
* Zom^^iQExfiYimentais of Niier is lodged in the Acid "^ ^firit 
Medicationes circa Naturali^ ^.j^^ ^^^^^ FlXed bait J 
vonder Becke , defcribed which Acid Spirit, lu his opiuion, IS 
/;.io3.ofthereTraas,p.6i. compoanded of a f^rf^';i^matter,that is 
flexil and humid,and of Ef/^e-r^/r/corpulcles/hat are rigld,dry, 
aftiveand igneous,proceeedingfrom the Air^ And thefe Igne- 
ous particles, conceived by him to htccmmonto Niter and/^/>, 
he calls Nitro aerial fio\x\ whence the ^irtt of Niter derives its 
cauftiqueand corrofive nature, which he calls a Potential fire, 
and from whence he thinks alfo that the Form of Fire chiefly, if 
not only, depends. Now,forafmuch as this Nitro-aerial igneous 
Spirit 
