Ills 



J 



1 



al 



tD 



n 



V 



a 



3W 3t 





ne 



I 





y 



HUTTONIAN THEORY. 



i6i 



haCis of all the great chains of mountains, and 

 as conllituting a feparate divifion of the mineral 



Icingdom, bj J. G. Lehman, director of the 



J 



Pruffian mines. See his work, intituled, Effcii 

 d^une Hijloire Natiirelle de Couches de la Terre *. 

 Thefe rocks were regarded by Lehman as parts 

 of the original nucleus of the globe, which had 

 undergone no alteration, but remained now fuch 



they were at firft created 



d 



greeably 



this fuppofition, he beftowed on them, and on t 

 mountains compofed of them, the name of p 



mitive. He remarks 



thelefs, their dift 



bution into beds, either perpendicular to the 



rizon, or highly 



d 



d th 



fuper-po 



tion of the fecondary, and horizontal ftrata 



Howev 

 iheoriei 



mineralogifts may 



diiTer in th 



from Lehman, they muft confide 



this 



diflindion as a great ftep in the fcience of g 



logy 



d 



ery material to th 



ght 



g 



th 



ment of the natural hiftory of the earth. 



149. Several mineralogifts have agreed w 

 him in the fuppofition, that thefe rocks are a part 

 of the original ftruaure of the globe, and prior to 



ganizcd 



Of this number is P 



and alfo De Luc, who appl 



th 



term 



L 



primordial 



* Tom. iii. p. 239, &c. The French tranflation is in 

 759, but the original preface is dated at Berlin 1756. 



t Obfervatlons fur la Formation des Montagues . 



