[)Q THE GEOLOGIST, 



of the instructive that is gained by the more adventurous tourisL-^t 

 would therefore point out one or two places, not more than six or 

 seven miles from that place, which few persons visit, and which 

 none should return home without seeing. 



To the east of Killarney, at the foot of the cloud-capped Mangerton, 

 there lies a rocky glen called " Glenacappul,""^- or the " Horse's Glen." 

 In it are three little mountain-lakes or tarns," which generally 

 appear as black as ink. The rocks are, the red, green, or grey grits, 

 and slates of the old red sandstone. 



On walking down the glen from north to south, the strata are seen 

 bent by numerous contortions, at both the top and bottom of the 

 cliff ; but midway, and interstratified with these beds, is a broad band 

 of "igneous rock," the flexures and folds of which are similar to and 

 coincident with those of the former. This igneous rock is a felspathic 

 trap," or "felstone," and is a compound of felspar and quartz. It is 

 generally of a bluish green or whitish colour, very hard, sometimes 

 containing crystals of white felspar, which, when large and numerous, 

 give it a porphyritic character. 



At both the upper and lower surfaces of this band of trap, between 

 it and the sedimentary rock, there are beds of flaky ash, of a green or 

 yellowish green hue. 



The massiveness of the rocks, their contortions, the striking ap- 

 pearance of the trap, the stately height of the cliffs, the dark and 

 gloomy waters of the three lakes— all combine in giving an unspeakable 

 grandeur to Glenacappul. 



A couple of miles further east, and south of Lough Guitane — a pic- 

 turesque lake situated on the southern side of the mountain-road leading 

 from Killarney to Glenflesk— is another glen, called Cappagh Glen, 

 rts sides are also lofty and rocky cliffs, and the band of trap inter- 

 stratified with the sandstones on its western face presents much the 

 same appearance as that in the Horse's Glen. Both in form and 

 size the two glens are much alike; but the wildness of the latter 

 (m wluch patches of heath and a few ferns alone are seen) is com- 

 pletely softened down in the former by the luxuriance of the 

 natural wood, principally oak and holly, the abundance and size of 

 the (lillereut species of ferns— from the lofty ''Brake"! (Pteris 

 * Cappul, Irish for " horse." 



t 'ri'is foin grows horo to a height of more than ten feet. 



