The distribution of the Irish language in 1871

The distribution of the Irish language in 1871 - From E.G. Ravenstein, “On the Celtic Languages of the British Isles: A Statistical Survey”, in Journal of the Statistical Society of London, vol. 42, no. 3, (September, 1879)

793 x 967

‘Bearing in mind most of the red areas are very sparsely populated (and were at the time of the map, too) does anybody have an estimate as to what percentage of the total population would fall into the various red and pink categories?

They weren’t as sparsely populated back then though. Yes it’s post famine, but the depopulation of the West took place over 150 years’