"Ireland, in fact," writes M. Darmesteter in his "English Studies," well summing up the legitimate conclusions from the works of the great Celtic scholars, "has the peculiar privilege of a history continuous from the earliest centuries of our era until the present day. She has preserved in the infinite wealth of her literature a complete and faithful picture of the ancient civilisation of the Celts. Irish literature is therefore the key which opens the Celtic world." But the Celtic world means a large portion of Europe, and the key to unlock the door of its past history is in the Irish manuscripts of saga and poem. Without them the student would have to view the past history of Europe through the distorting glasses of the Greeks and Romans, to whom all outer nations were barbarians, into whose social life they had no motive for inquiring. He would have no other means of estimating what were the feelings, modes of life, manners, and habits, of those great races who possessed so large a part of the ancient world, Gaul, Belgium, North Italy, parts of Germany, Spain, Switzerland, and the British Isles; who burned Rome, plundered Greece, and colonised Asia Minor. But in the Irish romances and historical sagas, he sees come to light another standard by which to measure. Through this early Irish peep-hole he gets a clear look at the life and manners of the race in one of its strongholds, from which he may conjecture and even assume a good deal with regard to the others. That the pictures of social life and early society drawn in the Irish romances represent phases not common to the Irish alone, but to large portions of that Celtic race which once owned so much of Europe, may be surmised with some certainty from the way in which characteristics of the Celts barely mentioned by Greek and Roman writers re-appear amongst the Irish in all the intimate detail and fond expansion of romance. M. d'Arbois de Jubainville has drawn attention to many such instances. Posidonius, who was a friend of Cicero, and wrote about a hundred years before Christ, mentions a custom which existed in Gaul in his time of fighting at a feast for the best bit which was to be given to the most valiant warrior. This custom, briefly noticed by Posidonius, might be passed by unnoticed by the ordinary reader, but the Irish one will remember the early romances of his race in which the _curadh-mir_ or "heroes' bit" so largely figures. He will remember that it is upon this custom that one of the greatest sagas of the Cuchulain cycle, the feast of Bricriu, hinges. Bricriu, the Thersites of the Red Branch, having built a new and magnificent house, determines to invite King Conor and the other chieftains to a feast, for the house was very magnificent.