D. MACKINTOSH ON HIGH-LEVEL MARINE DRIFTS. 369 



Dr. Hicks thought that no theory could be founded on the special 

 direction of the slaty curvatures, as he had seen them in all direc- 

 tions. He asked if a glacier crossing Ireland along a north-west 

 direction might not dam the sea up, so as to partially overwhelm 

 "Wales. He did not understand how the erratics could arrive at 

 exactly the same points both from Ireland and the Solway. 



Mr. Mackintosh, in reply, said that he thought that a grounding 

 iceberg might, if raised first up hill, then slip slightly down hill, 

 and so bend the edges of the slaty laminse. To Dr. Hicks he replied 

 that the currents in the sea were far from being necessarily parallel. 



