CORRYS WITH OR WITHOUT LAKE-BASINS. 135 



evident, as we before pointed out ; for while, as a 

 general rule, that has few exceptions, the cooms, 

 corrys, and cliffs are situated on the east and north 

 sides of mountains, the west and south sides of the 

 hills are slopes. (See page 78.) 



It may also be mentioned in favour of marine action 

 having partially excavated the corrys, that such fea- 

 tures occur at distinct elevations. Two or more corrys, 

 in the vicinity of one another, may have their floors 

 on different levels, or even in a large corry there may 

 be two or three cooms at different heights ; but if 

 the altitude of all the cooms and corrys in a group of 

 mountains or in separate groups of mountains are com- 

 pared, they are found to be in systems. In larcon- 

 naught and South-west Mayo, systems occur at heights 

 of 250, 350, 470, 650, 750, 1000, 1200, and 1400 feet ; 

 while in Kerry, from the elevations given by Mr 

 Close, they seem to be found at elevations of about 

 450, 750, 1000, 1250, and 1500 feet in altitude. As, 

 however, there are numerous corrys not mentioned 

 by this observer, this evidence is not conclusive. 1 



1 All the groups of hills in West Ireland, from County Sligo to 

 County Cork, are, as a rule, much more escarped on the north and east 

 sides than on the south and west. This fact, combined with peculiari- 

 ties in the drift, led me, on a former occasion, to suggest that, about 

 the end of the glacial period, there must have existed a strong ocean 

 current flowing from the N.N.E. to the S.S.W. (" Notes on Some of 

 the Drift in Ireland," Dublin Quart. Jour. Science, vol. vi. pp. 249, ct 

 seq.), also that to this current the steeps were due. I would now wish to 

 slightly modify this suggestion ; for although such a current must have 



