Part IV. of the Earth. 



Ibmetimes to kill the Miners, break 

 their Limbs, (hake the Earth, and force 

 Coles, Stones, and other Bodies, even 

 though they be of very great Weight 

 and Bulk, from the bottom of the 

 Pit or Mine, up through the Shaft, 

 difcharging them out at the Top or 

 Mouth of it, fometimes ftriking ofFth^ 

 T^r;^^ w^hich ftands thereon, and mount- 

 ing all up to a great height in the Air ; 

 this being fucceeded by aSmoak.u^hich 

 both in Smell, and all other refpefts, 

 refembles that of fired Gunpowder; 

 and is, as may appear from thefe and 

 other Ph£nomena of it, nothing but an 

 Exhalation of Nitre and Sulphur.which 

 are the principal Ingredients of that 

 Compofition w^e call Gunpowder . That 

 as thefe Damps are caufed by Heat, fa 

 they are remedied by withdrawing that 

 Heat, and by conveying forth the mi- 

 neral Steams ; v/hich the Miners effect 

 by Perflations with large Bellows: by 

 letting down Tubes, and finking new 

 Shafts; whereby they give free. pafiage 

 and motion to the Air, which venti- 

 lates and cools the Mines, purges and 

 frees them from thefc mineral Exhala- 

 tions. 



■^That 



