132 
Mr. -W eaver on the 
sagacious should have been prevented by death from the completion 
of his valuable researches. The reader will find that the observa- 
tions of Mr. Stephens and myself, in general coincide; which is the 
more satisfactory, as we were mutually unacquainted with each 
other’s inquiries: the differences are not greater, than the unfinished 
state of Mr. Stephens’s notes will sufficiently account for; and I 
think it right to add, that this occasional discrepancy has induced me 
to pay the greater attention to the points, in which I found it to 
exist. 
§ 14. The Eastern mountain chain is composed of formations 
of granite, mica slate, quartz rock, clay slate, greywacke, trap, and 
porphyry. 
1. Granite . 
§ 15. The granite tract supports, and is bounded in the course 
of its extent by mica slate, quartz rock, clay slate, greywacke, grey- 
wacke slate, old sandstone, and first floetz limestone ; but gneiss 
constitutes no part of this mountain chain, and I have only in a few 
instances marked even the semblance of such a rock, in the line of 
junction between the granite and mica slate ; as in Glenismaule, 
Balreagh glen, Glenmacanass, and Glenasane : and even in these 
cases, though there be some tendency toward parallelism in the dis- 
position of the mica, this substance presents only 'discontinuous 
laminae, and the remaining ingredients are granular. 
§ 16. The granite region commences on the south side of the 
bay of Dublin, and proceeds in a continuous mass, without inter- 
ruption, to Blackstairs and Brandon on the south. It occupies 
generally the highest portions of the range throughout, over-topping, 
.with few exceptions, all the rest. But it is found also in the lowest 
position, as at the northern foot of the Dublin mountains, reaching 
