Tart Y\t. of the Earth. 



fofRl Shells, and other Animal Subftan- 

 ces, \vith Iron-ore, Spar, Vitriol, Sul- 

 phur, and the like, intruded into their 

 Pores: but far greater numbers of them 

 with Lumps of Flint, Ores of Metalls, 

 and Minerals, growing firmly to the 

 Out-fides of them, and oftentimes in 

 fuch quantity as that the Shell or Tooth 

 is wholly covered by thofe Minerals, 

 being immers'd or included in the Mafs 

 they conftitute ; ihlbmuch that 'tis ve- 

 ry ufual, upon breaking Flints, Fyri^ 

 &c. to find Fe&mesy Concha^ and 

 the like, enclofed, even in the very 

 middle of them. As common is it to 

 find Echim^ Cochlea^ Comh^y and other 

 Shells, having their Cavities fill'd up 

 with Ores of Metalls, Flint, Spar, Na- 

 tive Vitriol, Sulphur, and other Mi- 

 nerals. Not but that thefe Minerals 

 many times furvive the Shells which 

 gave them their Forms, and are found 

 even after they are rotted and difap«^ 

 peared 5 for though, when lodged in 

 Chalk, Or the like clofe Matter, which 

 preferves and fecures them againfi: e^t- 

 ternal Injuries, thefe Shells are con- 

 ftantly found upon, and aftually in» 

 vefting the Flint, Spar, or other Mi- 

 neralj and are commonly as fair and 



N 4 entire ■ 



