"It seems to be certain," says the Abbe McGeoghehan, "that Ireland continued uninhabited from the Creation to the Deluge." With this assurance to help us on our onward way I may venture to supplement it by saying that little is known about the first, or even about the second, third, and fourth succession of settlers in Ireland. At what precise period what is known as the Scoto-Celtic branch of the great Aryan stock broke away from its parent tree, by what route its migrants travelled, in what degree of consanguinity it stood to the equally Celtic race or races of Britain, what sort of people inhabited Ireland previous to the first Aryan invasion--all this is in the last degree uncertain, though that it was inhabited by some race or races outside the limits of that greatest of human groups seems from ethnological evidence to be perfectly clear."