i68 



ILLUSTRATIONS OF THE 



53. I 



th 



Neptunian fyfl 



as 



proved 



force of fuch inftances 



by Werner, an attempt is made to take off the 



L 



as are produced in 5 8 

 d 151, &c. by diilinguifhing rocks, as to 



into three different order 

 intermediate, and the fecor 



9» 

 th 



1-K 



for 



s 



P 



the 



dary, or, to fpeak more properly, into primary, 

 fecondary, and tertiary. The fame mineralo- 



gifl diftinguifh 



among 



of thefe 



rocks, between what he terms chemical and 



chanical depofit 



By mechanical depofites 



nderflood fand, gravel, and whatever bear 



the mark of fradlure and attrifton 



by chemical 



depofites, thofe which are regularly cryftallized, 



ive a tendency to cryflallization, and 



hich have a ter 



hich the action of mechanical caufes 



be traced 



Th 



ftindion is founded in na- 



and proceeds on real and palpable different 

 but the application made of it to the three 



kinds of llrata juft 



ated, feems by no^ 



titled to the fame praife 



The primiti 



but 



h 



depofi 



ntain, it is faid, 

 and are entirely 



nediate contain a 



pofed of them 

 ture of both, and alfo fome vefliges of organized 

 bodies : the fecondary coniiil almoft entirely 0? 

 the mechanical, or of the remains of fuch bo- 

 dies, with' little of the chemical. The firft of 



thefe, th 



are held to contain no mark or vef- 



1 1 ge' 



