( 6i6i ) ? 
ferruginous matter which was left of the burnt minerals.This 
Salt, hefaithy Was Tome of it as yellow as fafTroOj fome jike cU 
tron-colour, fome whitej andfome grceDi(h 3 which colors 
though they may feem to come from the feveral forts of Mines 
of IroOjBrafsj&o whence theSalt ifluessyct confideriog theEx- 
pen'mcnt made with it by Signor Bo^selli m his Hiftory of the 
late Burning of jEtna (of which an Account was given in 
IV^«?^.7j* Gf chefeTraa:s5) it was a Faftitious Salt, luch as is 
fold in (hops, being a concrete of Nicer, Sulphur and Vitriol 
burnt and fublimed. For, it feemsj when he found fo great 
a plenty of thisSaltj and had heard, that the force of Gun- 
powder was highly incfeaftd by the mixture of SalArmoniac^ 
and thence conccivedj that this Salt might have much con* 
tributed to the conflagration of this Mountain, and to the 
fufionof thefabuIous,andthe fluxing of the vitreous mattery 
he, foratryalj added fome of this -^^i/ -^mi^wi^^: to pulvcri- 
fcd fulphur and niter 5 but found, to his amazement, that it 
was fb far from being kindled by fire, that it manifeftly hie- 
dred the accenfion of the Brimftonc and Salt-peter, which 
were even extinguifli't by it as if water had been powr'd on 
them : And the fame happen'd, upon the addition of pow- 
dered coals, wont to be mix'd in common gun-powder. 
Which Experimentj headds^ made him fufpcft, that this 
Armoniac^ found about Mtna^ had not been exiftent in thofe 
caverns from the beginning 5 but that 'cis factitious, as was 
hinted above. 
For the other particulars of this Prefentj ccnfifting of 
many Figuid Stones^ shells^ Glojfo-petras^ Fijhes^ Plant s^Mi- 
mralBezoardt o{S\c\\y,^Ch we (hall not here enlarge upooi 
them, as being already defcribf d u many Authors. 
