270 Dr. FiTTON on the Geology of the 



its eastern and western sides by incumbent rocks of gi'eat variety ; 

 the structure and relations of which, as -well as of the granitic mass, 

 are in many places very distinctly exhibited. 



Within this mountainous district, distinguished by the interesting 

 and beautiful scenery which it presents, are found the copper mines 

 of Cronebane and Bally murtagh ;* and the lead mines of Glen- 

 malur ; the veins of lead ore at Dalkey, and that near the Scalp also 

 belong to it. The stream works commonly called tliG Gold mine^ 

 at the mountain Croghan Kinshela aie on the southern range of this 

 district and of the County of Wicklow ; and gold has been found 

 within it, at another mountain also named Croghan^ about seven 

 miles to the northward of that place, f 



The occurrence of tinstone at the " Gold-mine," where it has been 

 obtained in fragments,:]: is a fact which deserves attention ; for from 

 the great extent of primitive country in the Wicklow mountains, 

 the probability of finding veins of tinstone there, appears consider- 

 able. Porcelain earth in purity equal to the " China clay" of Corn- 

 wall, has been found in the lands of Kilranelagh^ on the south-western 

 side of this county \ and granite in a state of decomposition is found 

 so extensively in other parts of it, that this valuable production may 

 very probably be obtained there in considerable quantity. 



The country around the village of Bray^ at the distance of ten 

 miles from Dublin, presents within a small space an instructive series 

 of rocks ; and the appearances observable at Killiney^ first noticed I 

 believe by Dr. Blake of Dublin, particularly deserve attention. Schis- 



* An account of the metalliferous waters of these mines was published in the Philoso- 

 phical Transactions so far back as the year 1752, vols, xlvii. and xlviii. 



+ Gold is said to have been found also in the King's River ^ near the village of Holy- 

 wood, in the County of Wicklow. 



+ Report by Messrs, Mills and Weaver. Trans. Dublin Sociefy. 



