( 1 04 ) 
fing^Thatj^ theNitro-aerial Spirit,put intoa vehement effer- 
vefcence with the particlesof coiumon Sulphur, doth fooneror 
Jater exacuate and make fluid the Salino-metaliic parts thereof; 
Jo the fame Spirit penetrating into the bowels of the Earth/alls 
there upon the Terreftrial fulphur^and therewith fermenring/o 
breaks and attenuates the Salin parts harbour'd therein, that at 
length they bccomflexil, liquid, and highly acid; and thefe 
Salin parts being thus reduced to fluidity, become a fit recep- 
tacle for the Nitro aerial ones to lodge in 5 from the Arid 
unionof both which he affirmsfuch a bpirrt of Niter to be 
conflituted, as is obtain'dby Diftillation. And thefe particles 
of the Nitrous fpirit being thus generated in the Earth^meeiing 
with the Seeds of Fixed Sa!r,harbour d in the Earth, do quick- 
ly embrace the fame, and being clofely combined with them, 
makeup chat Salt called Mter. So that, according to this Au- 
thor^Sai'N'uer is made up of a threefold Salt ; whereof one the 
mofi: A6ive, deduces its origin from the Air, and is of an Ethe- 
real and Igneous nature 5 and this by its Architefton cal pow- 
er forms to it felfout of a Terreflrial matter a Salin vehicle, 
Vvhich,together with the Igneous fair refiding in it, conftitutes 
the Sp.ric of Niter:Which as foon as *tis genera ted,fal Is a work- 
ing upon the Fixed falts of the Earth brought to due maturity, 
and together with them makes up the Common Niter. From 
this Nitr^-acrial ?prk he derives all Fermentations tending 
both to the Produdlionand Diflblution of things. From the 
fame he deduces Kif/^/V/, and particularly Congelation^ and 
the Expanfion made therein ; where he examines the explica^ 
tion given by Des-Cartes of the Rarefaftion of congealed wa- 
ter. And as he makes Rigidity the EfFeft of that Spirit, fo he 
would have the Reftitution of Rigid and inflefled Bodies, in 
which confiOis Spr inline fs.to refult from the fame4 And acknow- 
^ To he met wiih in M-. ledglng, from the many Boylean Expe- 
Boyle's Fhyfico-Mechamcat rimeuts *,that the Air is endow*d with 
f^rToxf^d.'t/^ a confiderable Spring, he attempts to 
contiwtcitiontf the year 1669. glveau account, wheuce that EJaftique 
Oxford ) where the pQ^^t arifeth ; taking it for granted, 
full information 0^ xvhu our that the Air contains itore of thofe 
AHLhorhtndecUres, Nitro-aerial particles, that to him are 
abfo- 
