1905-1905. 
331 
with°thp han f 4 1 PreSe . nt ’ and lts western shores conterminous 
recen dred °° T ° f SOundin ^ belief sanctioned by 
whose m ^ ° Ur WeStern C ° aSt ° n 3 mudd y Pbteau, on 
Jr Art many D ° negal b0ulders close *> ‘he edge of 
bv tf T A P ° St - glacial Nation followed, indicated 
e el esker^d 8 ^ ” Sh ° reS ’ wMe ^cial and 
. . ke ” disappear beneath the waves of to-day. May we 
imagine these traces of land-ice and land-bogs to be com 
temporaneous during that post-glacial elevation, which some 
geologists consider was sufficiently great to connect Ireland with 
England and permitted the re-peopling of our island by 
animals from the less severely glaciated sister land ? 
In compiling this summary of the Club’s recent glacial 
work, I have felt strongly the lack of more thorough famfliarity 
with Similar work m other countries than is possible for those 
residing at a distance from great scientific libraries. When our 
work commenced in r8 93 , Ailsa erratics had been found for the 
first time m Ireland by Professor Cole, and we can still recall 
the warm interest excited by our first schedule handed in at the 
British Association meeting at Oxford in 1894, when its frequent 
occurrence m our drifts was mentioned. Ours was the first report 
ever received from Ireland by that Committee during its exist- 
ence of fully 20 years. Our Club’s Annual Proceedings have 
also furnished the Geological Survey with many useful data for 
eir drift memoir, showing the value of careful local records, and 
the patient accumulation of details only possible to residents in a 
oca lty. The corresponding assistance rendered to local work- 
ers by such a memoir, which correlates our own observations 
with a wide experience of drift deposits in other parts of our 
islands is also inestimable. 
We have proved the ubiquitousness of Ailsa rock, and the 
frequent occurrence of other Scotch erratics, whose presence at 
Belfast was noted by Messrs. Bryce and Hyndman in 184 r.a 
We have established the unexpected occurrence of rocks many 
miles n orth of their parent locality, and traced many trains of 
11. Beport on the Geology of Londonderry. Tyrone, and Fermaua-h 
By J. E. Portlock, F.R.S. Appendix, p. 738. 
