40 The Irish Naturalist. February, 
lands; (3) the Central Valley (Clyde and Forth Valleys) ; and (4) the 
Southern Uplands, and the last three were shown to extend into Ireland, 
and were traced across the island to the Atlantic coast. Particular 
attention was dra^ai to the close similarity both in nature and arrangement 
existing between the Ordovician and Silurian rocks of the Southern 
Uplands of Scotland and those of County Down and the neighbouring 
districts, while many of the quartzites and hmestones of the Central 
Highlands between the Caledonian Canal and the Grampian Fault were 
shown to have their counterparts in the counties of Londonderry, Donegal, 
and Tyrone. At the conclusion of the lecture R. J. Welch raised some 
questions on the subject matter of the paper. W. J. C. Tomlinson also 
commented on the interest of the paper, and pointed out how necessary 
it was that more work should be done on the same lines in Ireland as has 
been done by the Geological Survey in Scotland. Dr. Dwerryhouse having 
replied, the Chairman conveyed to Nevin H. Foster the congratulations 
of the Club upon his election as a Fellovv of the Linnean Society. He 
also expressed the regret that the Club is about to lose two of its members, 
Mr. and Mrs. Balfour-Browne, who are leaving for England. 
December 26.— A small band of members travelled to Downpatrick 
and proceeded on foot to St. Patrick's Holy Wells, Struell. After ascending 
Slievenagriddle, a protruding boss of igneous rock was examined. Several 
good specimens showing the junction of it and the Silurian rocks were 
obtained. Inmostc^isesnearthe junction what appeared to be " junction- 
breccia " was observed. Some exposed surfaces of the Silurian recks 
near the summit showed traces of severe glaciation. The glacial striae 
ran from north to south. Close to the highest point a small overflow 
channel or " dry gap" was pointed out. The descent of the hill was 
made to Lough Money, and after a visit to the stone circle at Eallyalton 
the party returned to Downpatrick. A brief visit to the grave of St. 
Patrick in the grounds of the Cathedral was made before tea. 
DUBLIN NATURALISTS' FIELD CLUE. 
July 13, 191 2. — Excursion to newly-made Land at North Wall. — 
A party of twenty members and visitors assembled at the Custom House 
Quay, and travelled down the river in steam launches. After landing 
near the lighthouse, the part}^ proceeded by the miniature railway- to 
the newly-made land, which is an eastward extension of the North Wall 
formed by the accumulation of mud and sand dredged from the bed of the 
river by the dredgers of the Port and Docks Board. The conductor, 
Mr. J. W. Griffith, m.inst.c.e., escorted the part}^ and gave an interesting 
acpount of the history and formation of this ground. A brief exami- 
nation of the rank flora, which has migrated into the area, was made. 
Several species of land shells were found, which had probably reached 
their present habitat via the Tolka river. Mr. and Mrs. Griffiths very 
kindly provided tea in the open air, and after some desultory collecting, 
the party embarked once more and returned to town. 
