138 CORRYS WITH OR WITHOUT LAKE-BASINS. 



on a more or less irregular junction of two or more 

 breaks; but subsequent weathering would modify 

 the form of the hollow, and make it more bowl- 

 shaped. 



As pointed out by Close, many corry lake-basins 

 are only in part rock-basins, they being often 

 partly formed by a bar of drift across the mouth of 

 the corry, while some only occupy hollows in an 

 accumulation of drift. In some of the corrys in 

 which there are rock-basins, also in others in which 

 there are none, there is a total absence of drift. 

 This is remarkable, as from C. King's account of the 

 dying out of the glaciers on the mountains of the 

 Pacific slope, it would appear that these, the last 

 parts of the glacier, are enveloped in accumulations 

 of moraine drift, and we should naturally expect 

 that in these cold north and east corrys the ice must 

 have lasted longest. 



In some corrys and cooms the lakes are dammed 

 in by moraine drift, but in others the drift bar is 

 evidently of meteoric origin. As far as our experi- 

 ence goes, every coom or corry is associated with two 

 or more breaks crossing one another obliquely ; and 

 if the description of the formation of the cooses on 

 the Galway coast is referred to, it will appear that 

 at least one of these break-lines must join into the 

 old coast-line. This break-line may be perpendi- 

 cular or oblique to the coast-line ; and if the latter, 



