Slieve League, however, if the Ordnance Survey maps are to be trusted, is not the finest cliff in Ireland. On the western coast of Achill Island are the cliffs of Croaghaun, 2192 feet high. But my friend, Colin Phillip, who was there in the summer of 1901, made a somewhat startling discovery. A piece of land to the west of Croaghaun, more than _a square quarter of a mile_, has been left out altogether from the map. Where this land should be a bay is marked; perhaps, however, his own words will describe better how the discovery was made. 'The seaward face of Croaghaun is usually spoken of as an almost perpendicular cliff of over 2000 feet. This is not true. It is a fine, rocky, more or less buttressed mountain face, dropping to the sea at an angle of perhaps 50 degrees in places. But its general inclination would not be so much. There appears to be a curious error in the Ordnance Survey map with regard to the sea front of this hill. Expecting to find a grand view of this giant amongst the cliffs of Ireland, I made for a point marked on the map as a headland, projecting well out to sea on the west side of Croaghaun, from which a complete survey of the face should have been obtained. I was astonished to find, instead of a broad bay, with the great cliff of the mountain descending into it, a narrow inlet, like a 'geo' in Shetland, on the other side of which, almost completely blocking the view, was the south-west buttress of Croaghaun, and certainly not steeper than 40 degrees.' The whole bay, therefore, as marked on the Ordnance map, is now occupied by the lower part of the mountain; consequently, instead of a sheer cliff, this western side of the mountain is no more than an easy slope which may be traversed in many places. Another piece of information of Phillip's which may be novel, is that perhaps Sir Walter Scott was right when he called the hills in Skye the Cuchullin hills. During a discussion on the Skye hills with Mr. Seaton F. Milligan (past vice-president of the Royal Society of Antiquaries of Ireland), whom Phillip met on the west coast of Ireland, Mr. Milligan said that the hills had been named after the Irish hero Cuchulain; and the reason he gave was the following:-- In those early days the sons of the kings of Ireland were often sent to Skye to learn the art of war. At the end of their first year, a test of their progress was whether they were able to walk across what was called 'the bridge of the cliffs'; this bridge is supposed to have been part of the ridge of the Coolin. The bridge is thus described in the legend:--