IN THE NORTH OF IHELAND. 833 



the former probable ice-flow ; but they would obviously be very few. 

 Striae bearing northward are, however, by far the most numerous ; 

 from which we conclude that during the decline, or possibly after 

 the decline and subdued revival of glacial conditions, an inde- 

 pendent Irish Mer de glace flowed northward and southward, finding 

 its axis of movement in the Great Central Snow-field. 



It need scarcely be added that south of the Galway Bay 

 and Strangford-Lough line, the ice-movement appears to have 

 continued unchanged in direction throughout the glacial epoch, 

 until the Mer de glace gave place to numerous independent local 

 systems, with their glaciers and moraines, which marked the 

 decline and extinction of glacial conditions in this country. 



Discussion. 



Mr. Maee commented upon the supposed partial obliteration of 

 one set of striae by the ice which had produced a second ; whilst the 

 latter appeared to be comparatively fresh, though overridden by a 

 third ice -flow. 



The Peesident noted that Prof. Dana had brought forward 

 evidence to show that the ice passing down valleys in Connecticut 

 moved in quite a diff'erent direction from that passing over the ridges. 



