( 4^2 ) 
fcrongef, and confequently the heat gmtcv^ witnefs chat a lirtle 
water, put to 0// of Vitriol j prefently fets the fermenral prin- 
ciplesofacidum and fulphur^connatural to that Oi!,intoa ftrong 
ebullition, whence rerulcs fo great a hear,as the glafs, 'tisdonein, 
can hardly be endur'd by the hand, efpecially if the Oil be well 
refiified ; which he confirms by the Cbfervation of good Au- 
thors, afierting that in niany places Mi;7es are found fo hor, that 
they can Bardly be touch'c : As the Miners of jUom, or Vitriol^ 
being broken and expos'd to the Air, contrafl fo ftrong a heat, as 
fomecimes to caufean adual ignition, by which (he faith) not 
long fifice a B^rn at Teelmdw^d^v Halifax was burnt. 
Having thus deliver'd his Eyfothefis of the caufes of Hot 
Baths from the fermentation of mineral Juyces, caufed by acids 
and fulphurs, he goes on to fjlve from chence various other fub- 
lerraneal EfFeft5,fuch as are Damps ^ L^oyjonom Springs and Lakes^diS 
alfo thofeot Edrth-qtiAkes^ErupionSiComrete sulphurs, Sfm-vpa- 
ters \ concerning the laRof which he faith, that where there 
is a current of water irroratingfome Earths or mineral beds of 
Iron or Alom-ftone, there are made Vitrioline or Aluminous 
Spaws. Hence he defires his Reader to confider, whether from 
the fame fuppofition of caufes may be folved the diverfity of 
Wmds, the viciffitudes of Heat and Coldy the appearances of Me- 
teors^ Smrp^ Hail\ ^c. He offers alfo, from the fame principles 
toexplain the two great ph.'ienomena of Heat ^nd Light, found 
in concrete bodies • yet leaving it to further examination, whe- 
ther in that great Fountain of Light, the Sun, its perpetual ema- 
nation of Light may not confift in a peculiar fermentation of its 
own, fet a work by the Creator, and kept a foot by a continual 
circulation of Ethereal matter : Endeavouring in the mean time 
to fhew, I. How Heat is produced from fermentation in all fuch 
bodies where 'tis found. 2. How from the fame Principles of A- 
cid and Sulphur Light is made. Where by the by, he labours to 
prove, that the Fermentation in Mineral Juices, whether natural 
or artificial, proceeds not from the Contrariitjo^ SaJtSy becaufe 
there is no fuch ebullition among Sales,, bur what is from the con- 
fiift of Acids and Sulphurs, whereas it never yet could be made 
dippeav C faith he^ that thefe minerals con tain*d any f rtof A^xa^ 
/w,either fixt or volatile, though it be certain to him from irre- 
fragable experiments, that Sulphurs and 4cids dcct feparable from 
them 
