828 



ME. J. E. KILEOE OS DIEECTIOlJfS OF TCE-FLOW 



is. With this may here be mentioned that both sets have been 

 observed on the same flat surface in several instances, and that 

 both are alike found in the valle3"s and on the flanks and summits 

 of some of the highest hills. 



Directions of Stri(x. — Of the two sets of striae referred to, the direc- 

 tion of one varies from north to north-west, which, as evidence of ice- 

 movement, will be considered hereafter. The direction of the second 

 set is W. 25° S., swinging round to W. in Donegal, and S.W. 

 towards Galway Bay, and is strikingly persistent throughout. 

 The value of this fact will be appreciated when it is stated that if 

 we select a few scattered points by way of illustration, the di- 

 rection of striae is almost the same whether at 1200 feet above the 

 sea at Gleaarm, or near the sea-level at Belfast and Londonderry ; 

 700 feet above datum, S.W. of Draperstown ; 1250 in Slieve Beagh, 

 CO. Tyrone; 1200 in SI. League, co. Donegal; 1100 in the Nephin 



Pig. 1. — Map 



Glaciation of the Northern Parts 

 British Isles. 



Group, CO. Mayo, or on the shore of Sligo Bay. To account for 

 this uniformity of direction, whether at the sea-level or more than 

 1000 feet above it, whether in Antrim, Tyrone, Donegal, or Mayo, 



