136 Mr* Weaver on the 
There are few parts of the granite region in which schorl, tour- 
maline, and garnet, may not be casually found ; but it is only casu- 
ally, and in such small proportion that they must be considered as 
merely adventitious; and the same may be said of all the other 
minerals noticed. The garnet sometimes appears in the leucite form, 
as at Dalkey and Kilranela. 
The first beryls discovered in the granite were found by me 
several years ago in a loose boulder at Cronebane. They were 
imbedded in a large grained contemporaneous vein which traversed 
the finer grained rock. Since that time others, as well as myself, 
have remarked them in several parts of the granite tract, as in 
Glenmacanass, Glencree, the Scalp, and more recently at the foot of 
Rochetown hill, where Dr. Taylor has discovered specimens of great 
beauty, some of them being nearly two inches in diameter. It was 
in this vicinity also that most of the other minerals mentioned by 
this gentleman were found. In Glenmacanass, near the waterfall, 
imbedded crystals of beryl, garnet, and tourmaline, may be frequently 
seen in the coarse grained contemporaneous veins of granite, and the 
rock itself is remarkably fine grained, and of a very firm texture. 
§ 19. The granite tract abounds in contemporaneous veins of 
granite ; and also of quartz, which however, are not quite so fre- 
quent. The former vary from the smallest to a very large grain, 
and in width from that of a thread to two feet. There is no glen in 
which the rock is at all denuded, in which they may not be studied 
to advantage; and no where more so than among the sublime 
scenery of Glendalough. In viewing this glen, from its head at the 
top of the waterfall, which is not less than six hundred feet above 
the lake, the eye takes in at a glance its whole compass, with its 
abrupt precipitous sides, the upper and part of the lower lake, with 
the hill of Castlekevin beyond. It constitutes a stupendous exca- 
