DUBLIN. Royal Irish Academy, Dec. 10.-A. Farrington: The pre-glacial topography of the Liffey basin. In pre-glacial times the present Liffey basin was divided between the catchments of two separate streams. One of these catchments included the hill-encircled basin of the upper Liffey and the Kings River. From this area the drainage escaped in a westerly direction. The second catchment was that of the Rye-Water river, which flowed eastwards to Dublin Bay. The portion of the present Liffey which connects these two basins is post-glacial in date. The theory that the diversion of the upper Liffey was due to the lowering of the valley by glacial scour is discussed and rejected. The development of the present course of the Liffey is traced from its initiation as a consequent stream on a westward-sloping plain. This plain was certainly post-Cretaceous and is probably of mid-Tertiary age.