The purpose of the Ordnance Survey of Ireland was to map the whole country at a scale of six inches to one mile, and the six-inch maps appeared between 1835 and 1846. Each map was to have been accompanied by topographical descriptions, or memoirs, for every civil parish, but this was impractical, and the idea was abandoned. However, the field officers gathered much useful data, and the notebooks in which the information was recorded are now in the...