C;t71 
before the WorM could be all over Peopled ; befides they 
are moftly the very Tops of vaft high Mountains, and 
therefore the moft unfit for the habitation of man. 
If we fay Lightning and Thunder or Earthquakes ; we 
beg the queft on ; for the Caufe of the one is the Canfe of 
the other, and they are one and the fame. 
It remains therefore ( very probably ) that they were 
kindled of themfelves. 
I for my part know no Subjed in the whole Mineral 
kingdom fo general! and Jailing for the fuel of thefe 
Mountains, as the Pyrites ^ which I have faid alone to 
yeild Sulphur, and naturally relolves it felf into it, by a 
kind of Vegetation. 
About the durable burning of the Pyrites thefe are in- 
ftances. Scotch-coal hath lefs of the Pyrites in it, being 
moftly made up of Coal Bitumen, and therefore it burns 
and confumes quickly, and leaves a white Cinder. Sea 
Coal^ or that Coal which comes from Newcaftle by Sea 
to us , and for that reafon fo called, burns flowly ; and the 
Sunderland Sea Coal lo llowly, that it is faid by Proverb, to 
make three fires; this hath much Pyrites mixt with it, 
and burns to a heavy redifh Cinder, which is Iron, by the 
magnet. Butlhavefeen, and have a fpecimen by me 
of a Coal from Ireland, the Proprietour of the Pits isSir 
Chriftophcr Wandsford, which is faid to be fo lafting, 
that it will continue twenty four hours red hot, and al- 
moft keep its figure : This leems to be in great part Pyrites 
by the weight and Colour. 
The third Paper of the fame per fon^ concerning Thun- 
der and Lightning being from the Fyrites. 
T^Here are two forts of Inftances befides theArgo- 
iiients I fprnierly urged, which tp me are alone fuffi» 
ciently 
