Part IV". of the Earth, t60 



the Thunder dfthefe Northern Climes, 

 as the Heat there exceeds that of thefe 

 Climes. That the mineral Matter 

 which is difcharged forth of Vuluno^s^ 

 and other like Spiracles: and out of the 

 Thtrw£, afcends up into the Air, and 

 Contributes to the Formation of thefe 

 Meteors. That likewife the Nitre 

 and Sulphur, which are belch'd forth 

 of the Earth at the time of Earthquakes 

 ( the Countries which are moft obno- 

 iiious to this Malady abounding, I 

 have already intimated with thefe t 

 two Minerals particularly ; ) in fuch 

 plenty as to thicken and darken the 

 Air, conftitute there a kind of Aerial 

 Gunpowder, and are the Caufe of that 

 difmal and terrible Thunder and Light- 

 ning which commonly, if not always, 

 attend Earthquakes; even when all 

 was till then calm and clear, and not 

 the leaft Sign or Prefage of any fuch 

 thing before the Earthquake began. 



That as the mineral Eruptions which 

 happen during Earthquakes * : and the * y'^' tn- 

 Steams and Damps of Mines 1) are detri- jj^/j^'J' 

 mental to Health, hurtful and injurious 2o6.fitprM. 

 to the Bodies of Me» and other Jni" 

 mds^ fo likewife are the Mineral Ex- 

 halatms which are thus railed by the 



P Sff» 



