054 Swientific Proceedings, Royal Dublin Society. 
The only previous record of the occurrence of Cassiterite i 
situ in Ireland is contained in Griffith’s “ Report on the Metallic 
Mines of the Province of Leinster,” 1828, where he says:— 
“‘ With the exception of crystals of oxide of tin found in the gold 
wash at Croghan mountain by Mr. Mills, and those subsequently 
found in the granite at Dalkey by Dr. Taylor, the ores of tin have 
not hitherto been found in this district.” The locality near 
Dalkey was the lead mine formerly worked in the confines of 
Victoria Park. William Mallet, in a paper on “The Minerals 
of the Auriferous Districts of Co. Wicklow,” similarly records 
the occurrence of stream tin in the gravels of the Gold-mines river 
near Croghan Kinshela, associated with several other minerals, 
including gold, platinum, and wolfram. G. H. Kinahan,? in 
addition to the foregoing, mentions two other localities, one in 
Co. Cork and one in Kerry. In neither case is the occurrence 
sufficiently authenticated, and the presence of Cassiterite in both 
localities must be regarded at present as very doubtful. 
The first record of the occurrence of Cassiterite in Ireland dates 
from 1796 (circa), when its discovery was announced by Weaver, 
who identified this mineral in the washings at Ballinvalley Gold 
Mines, associated with other heavy minerals. This discovery was 
reannounced at intervals during the next few decades by others, 
including Smith (1840) and Mallet (1851).’ 
Nore ADDED IN THE PREss. 
Since this note was written Dr. Joly informs me that he found 
some small crystals of Cassiterite in a much decomposed pebble of 
granite, taken out of the boulder clay near Greystones, several 
years ago. 
1 Journ. Geol. Soc. Dublin, vol. iv. (1851), p. 269. 
2 «Keonomic Geology of Ireland,’’? Scient. Proc. Roy. Dublin Soc., vol. v. 
(1886-7), pp. 200;and 207 (pp. 11 and 17 of the work as separately published). 
3 See London, Edinburgh, and Dublin Phil. Mag., vol. xix., 1841, pp. 27-31. 
