PROGRESS OF PHYSICAL GEOLOGY. 657 



is probably now past for ever ; and geology wilj 

 not again witness such a controversy as that of the 

 Wernerian and Huttonian schools. 



As when two black clouds 



With heaven's artillery fraught, come rattling on 

 Over the Caspian : then stand front to front, 

 Hovering a space, till winds the signal blow 

 To join their dark encounter in mid-air, 

 So frowned the mighty combatants, that hell 

 Grew darker at their frown ; so matched they stood : 

 For never but once more was either like 

 To meet so great a foe. 



The main points really affecting the progress of 

 sound theoretical geology, will find a place in one 

 of the two next Sections (JA). 



VOL. III. 



Uu 



