(415 ) 
willperform what Other moreufual Acids cannot; E. g, that 
Lme-rvater mixed with any volatile Urinous Salts , and diftii- 
led there-from, fixes the Salt ^ and even turns it into an infipid 
powder, or indifiTolvable calx, &c. After which , he fpends a 
Chapter in explaining , how the Heat and Ignition, which is 
caufed from the Coilifions and Attritions of hardhoditSy maybe 
eafily folved froai the Principles delivered by him. 
And havingrun through the Gaufes of Heat znd Fire ^ as the. 
refult from all forts of Fermentations, and fliew'd , Beat to be 
Firein a remifs, and Fire Heat in an intenfe, degree, as alfo, 
that thefe Fermentations proceed from a conflict of Jcidum diX\d 
Sulphury excepting thofe made from an inrefiine combat of an 
Acid dXid a fixt Jlcalt ^ or an Acidum and Urinous fpirits; he 
comes to explain, Howfrom hisdoftrineof Fermenration may 
be folved that grand phMomenon of Lif ht ; and /?r/?, the Light 
from Culimr/'jire or ordinary combuflible concretes, pue 
into that rapid fermentation we call Fire: Kext^ the Light of 
all Sulphurous matters:^ whether in the dry form of t^inerd 
fulphurs, rejinous Gums ^ Turpentine^ Axu?fgias^ d^c» or m L'l" 
qixidSydiS Bitumens y Oy/s. Vinous fpirits,&c: Then, the Light of 
rottenWoodJong' dried Ftfh, Gloworms^ Catseyes-^ as alfo that 
ft ovs\ Attrition of mod^dSidoi steel and Flint) from the/r/- 
Bion or combmg of Animals ^ and Irkewife the Light of [ub- 
terraneal Lamps : Upon which laft Head he fomewhat enlarg- 
eth by difcourfing of the poffibility in nature of fuch a kind of 
Fire, that rniy be maintained and perpetuated without Air^ 
affirming, thathimfelf hath feen a Flame or Fire in thecavicyof 
aGlafs, which as foon as the ftopp!e was taken oar, was (con- 
trary to all other fires j immediately exringuifli'd. To which 
he fubjoyns an explication of the Light of fjme precious Stones^ 
ihQ Bononian Jlone ^ and likewife of M^/w/^ all which give 
light in the Air not illuminated by any light from the Sun , but 
by an excitation of their intrinfick Ferments, fetting above- 
board their inCid^ tepor. 
He concludes the whole, partlj by confirming his Principles 
from collateral authority; partly by fijewing. How that all 
manner of Coagulations^ Congelations^ Qndenfations^ Salifications:, 
Petrifications ^ and all forts of Concretions of bodies (or of 
Joyces into bodieS3)are primarily afcribable to Jcids 3 and that 
