GLACIAL THEOET. 45 



conclusions formed in favour of the theory from the striated 

 markings presented by the surface of the rocks. He found 

 these marks to pervade the internal structure as well as the 

 surface ; and as they occur parallel to the plane of the 

 magnetic meridian, he ascribes them to electro-magnetic 

 agency, operating during the induration of the mass. Mr. 

 Hopkins denounces the theory as contrary to every principle 

 of physics, in relation to the phenomena of several districts 

 to which he has directed his researches; and finally, Dr. 

 Buckland, in his Anniversary Address (1841), intimates that 

 the opinions of Professor Agassiz and himself as the sup- 

 porters, and those of the opponents of the theory, " will 

 probably be settled, as in most cases of extreme opinions 

 and exclusive theories, by a compromise; the glacialist 

 will probably abandon his universal covering of ice and 

 snow, and be content with glaciers on the elevated regions 

 of more southern latitudes than now allow of their forma- 

 tion ; the diluvialist, still retaining his floating icebergs 

 as the most efficient agents in the transport of drift and 

 erratic blocks to regions distant from their place of origin, 

 may also allow to glaciers their due share in the formation 

 of moraines and striated surfaces, in latitudes and at eleva- 

 tions that are no longer within the zones of perpetual 

 congelation." 



