/ 



ce 



whi 









>■» 



idati 



ic 



hfott 



iiftiii: 



;hoE 

 red: 



e 



jfroi 



s, 



till 





I 



HUTTONIAN THEORY. 



3i 



of this foflil, is, that the whole mafs was origin- 

 ally fluid, and that, in cooling, the calcareous 



^ ■ 



part feparated from the reft, and afterwards 

 cryftallized. 



27. It has been urged againft this theory of 



the feptaria, that thefe ftones are fometimes 

 found with the calcareous veins extending all 



^^S^"i the way to the circumference, and of courfe 



Kutit b 



.Jott 



communicating with the otitfide. But it muft 



e obferved, that this fad: does not affed: the 



argument drawn from fpecimens in which 



avoui fuch communication takes 



on tl only an ambig 

 Man plained by twc 



' r 



It is at befl 



fiance, that may be ex- 



ppofite th 



hiHo re( 



led either to the 

 s confolidatibn : 



but if there is 



fom clofe feptarium in 



es, and may be 

 of igneous or of 



a fingle 



of courfe. be 



o 



Lplained only by one of thefe theories, and the 



ther muft, of neceffity, be rejeded. Befides 



is plain, that a clofe feptarium can never hav( 



£0, been open, though an open feptarium may very 



been clofe ; and indeed, as this ftone 

 circumftances, fubjed to perpetual 



well h 



foliation, it would be wonderful if 



ever found 



w 



the 



reachin 



fur face 



t> 



With regard to the light, there- 

 fore, that they give into their own hiflory, thefe 



two kinds of fep 



qual footi 



are by 



means on an 



and this may ferve to fhew, how 



necelTary 



t 



