58 



narrow caves ; the latter instances proving that the 

 sea is capable of working along the fault-rock much 

 faster than meteoric abrasion. 1 Some of the deep 

 narrow straits in South- West Cork are remarkable, as 

 the old walls of the fissures still exist in part, show- 

 ing the original hade or underlie of the fissures. 

 This is well exemplified in the Crowhead promontory, 

 barony of Bear ; the shore of the mainland and the 

 cliff on Crow Island, hading S.W. at an angle of 75 

 (fig. 13, PL II.), as if the two had been separated by 

 a clean cut. 



In conclusion, there is one effect of the sea which 

 may be mentioned, though but indirectly related to 

 the present subject namely, its power of producing 

 hot and cold currents of air, as these materially affect 

 the land on which they blow. 



1 In places on the west coast of Ireland, may be found two caves, 

 one above the other, the lowest being now in process of excavation, while 

 the higher one was cut when the land stood at a lower level. Would 

 not such double caves suggest the idea that the land must have 

 risen quickly between the formation of the two ? for if the rise was 

 gradual, the intervening rock should have been excavated away. 



