1 P4 77j^ Natural Hiflory Part lY. 



Pores of the Strata which confift main- 

 ly, or at leaft contain in chem a confi- 

 * Confer, derable quantity of thefe ^, being lef^ 

 pf'%^s narrower than thole of the 



ftfpta! ' Strata of Sand-ftone , and the like 

 common and craffer Matter, the Wa- 

 ter which afcends from beneath to- 

 wards the Surface of the Earth is ad- 

 fnitted into them, if at all, only in 

 lefler quantity, paffes them flowly and 

 difBcultly , and therefore hath not 

 Scope and Power fufEcient to diflodge 

 the Corpuicles, and bear them off with 

 it into the perpendicular Intervalls, as 

 it does in thofe Strata which confift 

 chiefly of Stone, and the like grofler 

 Matter, where the metalliek and mine- 

 ral Corpofcles lye thinner, and fb the 

 Fores are more wide and open. That, 

 for this reafon, in the Intervalls of thofe 

 Strata which abound plentifully with 

 Iron, Tin, Spar, common Salt, Alum, 

 or the like, we ordinarily find a lefler 

 quantity of theie Metalls and Minerals 

 refideot, tlian we do in the Intervalls 

 of feme other Strata which now fhew 

 little, or perhaps nothing in the Bo- 

 dies of them befides Sand and fiich like 

 coarfer Matter ; there being fo admi- 

 rable a Contrivance in this Affair, that 



