Some one has said that almost all that Ireland possesses of picturesque beauty is to be found on, or in the immediate neighbourhood of, the seaboard; and if we except some brief patches of river scenery on the Nore and the Blackwater, and a part of Lough Erne, the assertion is not devoid of truth. The dreary expanse called the Bog of Allen, which occupies a tableland in the centre of the island, s...