30 Mr. Weaver on Irish Tin Ore. 



county of Wicklow*, from which I have drawn most of the 

 preceding details. In that memoir I also showed that tin 

 ore was not confined to the county of Wicklow, but that it had 

 been found in the county of Dublin also, though under dif- 

 ferent circumstances, for which discovery we were indebted to 

 Dr. Thomas Taylor, then living in Dublin, but latterly re- 

 siding on his property at Dunkerrin Castle, in the county of 

 Kerry. The information on this subject, derived from that 

 gentleman, I have embodied in the 1 8th section of my memoir 

 (at p. 135 of vol. v. Geol. Trans.), in which, in speaking of the 

 granite region, I have said, "The minerals which I have 

 incidentally observed disseminated in the granite, or imbedded 

 in the contemporaneous veins of granite and quartz that tra- 

 verse the rock (which more particularly form their native 

 seat), are schorl, tourmaline, garnet, beryl, rock-crystal, epi- 

 dote, heavy spar, magnetic iron ore, galena, copper pyrites, 

 and iron pyrites. But in addition to these, I am indebted to 

 Dr. Taylor for the information that he has discovered in the 

 granite, malachite, arsenical pyrites, tinstone, spodumene, and 

 a new mineral, to which he has given the name of killinitef." 

 And in a note upon the tinstone thus found, I have added, 

 " It is an interesting fact that this metal should at length have 

 been discovered in rock in this country, although found only 

 in a contemporaneous vein traversing a loose block of granite ; 

 for its existence in the county of Wicklow, in the form of stream 

 tinstone, had been ascertained several years ago by the opera- 

 tions of the Directors of the works at Croghan Kinshela." 



We have it thus upon record that tin ore has been found 

 in three distinct localities in Ireland, two in the county of 

 Wicklow, and one in the county of Dublin ; the latter being 

 at the south-western foot of Rochetown-hill, adjoining Killi- 

 ney Bay. 



I may here add, that the "tinstone of a hair-brown colour, 

 which accompanies frequently in small grains the native gold 

 found in the streams at Croghan mountain, county of Wick- 

 low," being No. 213 of the late Sir Charles Giesecke's Cata- 

 logue of Irish Minerals in the Museum of the Royal Dublin 

 Society, published in 1832, and adverted to by Dr. Smith, 

 was presented by myself before the year 1818. 



So lately also as in the year 1835$, having had occasion to 

 notice a strange misapprehension of facts respecting the gold 

 workings formerly conducted in the county of Wicklow, as 



* See §§ 105 to 107 inclusive of the Memoir in pp. 208 to 213 of vol. v. 

 of the Geological Transactions, First Series. 



f See the description and analysis of this mineral by my friends Dr. 

 Thomas Taylor and Dr. Francis Barker, Prof. Chem. Trin. Coll. Dublin, in 

 the 13th volume of the Transactions of the Royal Irish Academy, 1818. 



X See the London and Edinburgh Philosophical Magazine for July 1835. 



