IS 4 
Mr. Weaver on the 
largest and most beautiful grained is found toward tbe northern 
extremity, at the Scalp, in Glencree, and at Leopardstown at the 
foot of Three Rock mountain ; and toward the south, in the district 
between Borris on the Barrow and Scullogh gap. The finest 
grained of the fundamental granite that I have met with, occurs at 
the northern foot of Cadeen, in the glen of Imale. It is a remark- 
ably close, firm, and fine grained rock, appearing almost compact; it 
is accompanied, however, by a coarser grained, with which it appears 
to alternate in layers, as may be seen in the brook which flows down 
the northern face of the mountain. The granite is not unfrequently 
porphyritic. This may be observed in almost every glen around 
the mountains, as in Glenismaule, Glencree, and at the head of the 
waterfall in Glenmacanass, where the felspar crystals acquire a length 
of three inches nearly, inlaid in a small grained base. 
But there is one portion of the granite tract, that requires more 
particular attention. It is that in the vicinity of Eagle hill, Knocka- 
tomcoyle, and what are called the White Rocks , situated in the granite 
flat on the western side of the chain. In the composition of the 
rock at these places quartz greatly predominates, and sometimes so 
much so, as to exclude all appearance of granite, and to become pure 
quartz. 
The eastern side of Eagle hill corresponds with the usual granite 
of the country, in the size of its grain and proportion of its ingre- 
dients ; but in its summit, which forms an abrupt face to the north, 
quartz appears as the principal ingredient, affecting a considerable 
variety of aspect. On the western side are great masses and blocks 
of pure white compact quartz, and lower down on that side is the 
firm quartz rock itself. On the south again, the face of the rock is 
bared and the granite here appears mostly composed of quartz, the 
prevalence of which however becomes still more striking in the 
