of the Earth. 2 1 



Cavities of Shells of thofe kinds which 

 they fb refemble ; thefe Shells having 

 ferved as Matrices or Moulds to them ; * co7Jcern- 

 the Sand , Sparry and Fhnty Matter ^^^A^ 

 being then foft, or in a ftate of fbluti- CochiitL? 

 on, and fb, fufceptible of any iovm^&c.fie ' 

 when it was thus introduced into thefe ^^^f^^'^^nd 

 fhelly-MouIds : and that it confohda- part i 

 ted, or became hard afterwards ^^''f- 5^* 



That for the MetalHck and Mineral 3. 

 Matter which fbmetimes adheres to 

 the Surfaces of thefe Shells, or is ia- 

 truded into their Pores, and lodged in 

 the Interftices of their Fibres, 'tis all 

 manifeftly adventitious f 5 the mineral ^ p^^. ^ 

 Particles being plainly to be diftinguilli- conf. 2, 

 ed from the teftaceous ones, or the tex- 

 ture and fubftance of the Shell, by good 

 GlalTes, if not by the naked Eye. That 

 though the thing had been fo that this 

 Accretion had not been thus difcer- 

 nible, and confequently the Alteration 

 of thefe Shells could not have been ac* 

 counted for, fb that we had been per- 

 feftly in the dark as to the Origin of 

 the Bodies thus altered, and that no- 

 thing at all could have been determi- 

 ned concerning them:^ yet this would 

 not have been any the leaft Impedi- 

 ment or objection againft that which 



C 3 I in- 



