From this ignorance of their Celtic kinship and origin we must draw one important conclusion. The extraordinary vitality of popular tradition in some respects must be set off by its extraordinary mortality in other respects. There must have been a time when the Celts of Ireland, Britain and Gaul were fully aware that they were nearer akin to each other than to the Germans and Italians, but this knowledge perished altogether from the popular memory and the popular consciousness. It was re-discovered and re-established by a Scottish Gael, George Buchanan, in the sixteenth century. Buchanan, in his history of Scotland, published in 1589, dismissed as fabulous that section of the Irish and British genealogies that purported to trace the origin of each people, generation by generation, from Japhet. He was a man of great classical learning. No better refutation could be adduced of the notion that Bacon, who was a child when Buchanan wrote, established the inductive method of scientific proof than the clear and well-marshalled argument by which Buchanan proves from numerous Greek and Latin sources that the Gaels and the Britons were branches of the ancient Celtic people of the Continent. An account of Buchanan's discourse on this subject will be found in an article by me in the "Irish Review," of December, 1913. Buchanan's discovery seems to have lain dormant, as regards any effect on learning or the popular mind, for more than a century. In his argument he dealt rather severely with the statements of a contemporary Welsh antiquary, Humphrey Llwyd, and this controversy had probably the effect of sowing the seed of what may be called Celtic consciousness in the soil of Welsh learning. In Ireland, though Buchanan's work was doubtless known and read, his theory of the Celtic origin of the Irish people and their language, and of their kinship to the Britons and the Continental Celts, does not appear to have been thought worth discussion, so firmly established were the ancient accounts which attributed to the Gaels of Ireland a Scythian origin. Yet these ancient accounts, as I propose to show in the third lecture of this series, did not belong to the true national tradition, ran counter to tradition, and owed their invention to the Latin learning of Ireland in the early Christian period. In 1707 the publication of the first volume of Edward Llwyd's "Archæologia Britannica" exhibits the first fruiting of Buchanan's theory, in the form of a sort of conspectus of the Celtic languages then extant, namely, the Gaelic of Ireland and Scotland, and the British languages of Wales, Cornwall and Brittany. From this time onward, the existence of a group of Celtic peoples may be taken as a recognised fact in the learned world. I do not know whether anyone has yet traced the early stages of the recognition of the same fact in Continental learning.