I M The Natural Hiftdry Part I 



arc alfo different in different places : in 

 fbme all, or moft of thenis of Sand- 

 ftone: in others of Chalk : atnd irt 

 others of both Sand-ftone and Chalk, 

 and perhaps many more, lying each 

 upon other. And the Cafe of Metalls 

 and Minerals being the fame, 'tis for 

 that reafbn that in fbme places we now 

 get Iron, or Vitriol ; but no Copper, 

 or Alum : in others we find thefe, but 

 not thofe: and in others both thefe, 

 and thofe, and perhaps many more. 



That the FUce^ both of the feveral 

 forts of Terreftrial Matter, and of 

 Metalls and Minerals, whilft fuflained 

 in the Fluid, being thus contingent 

 :^nd uncertain, their Intermixtures with 

 each other, and with the Terreflrial 

 Matter, in the Sediment, or Strata^ 

 which fubfiding they together compo- 

 fed, mufl confequently be uncertain 

 likewife ; that Metall or Mineral, of 

 whatever kind it chanced to be, which 

 was fuftained in any part of the Fluid, 

 lethng only diredly downwards, was 

 lodged amongft the Terreftrial Matter 

 which chanced to be fuftained together 

 with it in the fame part, of what kind 

 foever that Matter was. And accor- 

 dingly we now find them uncertainly 



mixt : 



