The book contains ancient lives of Irish saints, written in very pure Gaelic; the conquests of Charlemagne, translated from Archbishop Turpin’s celebrated romance of the VIIIth century; the conversion of the Pantheon into a Christian church; the stories of David, son of Jesse, the two children, Samhain, the three sons of Cleirac; the _Imtheacht na trom daimhé_; the story of S. Peter’s daughter Petronilla and the discovery of the Sibylline Oracle; an account of S. Gregory the Great; the Empress Justina’s heresy; modifications of minor ceremonies of the Mass; accounts of the successors of Charlemagne, and of the correspondence between Lanfranc and the clergy of Rome; extracts from Marco Polo’s _Travels_; accounts of Irish battles and sieges; and a dialogue between S. Patrick, Caoilté, Mac Ronain, and Oisin (Ossian), the son of Fionn Mac Cumhaill, in which many hills, rivers, caverns, etc., in Ireland, are described, and the etymology of their names recorded. This last is preluded by an account of the departure of Oisin and Caoilté on a hunting expedition, during which their gillie sees and is much troubled by a very strange spectacle. As this tale furnishes a good example of the contents of these ancient books, we subjoin a translation of the commencement of it.(58) “On a certain time it happened that Oisin and Cailte were in Dun Clithar (the sheltered or shady Dun) at Slieve Crott. It was the time that Patrick came to Ireland. It is there dwelt a remnant of the Fenians, namely, Oisin and Cailte and three times nine persons in their company. They followed this custom: about nine persons went out hunting daily. On a certain day it chanced that Cailte Mac Ronain set out with eight persons (big men) and a boy (gilla), the ninth. The way they went was northward to the twelve mountains of Eibhlinné and to the head of the ancient Moy Breogan. On their returning from the chase at the cheerless close of the day they came from the north to Corroda Cnamhchoill. Then was Fear Gair Cailte’s gilla loaded with the choice parts of the chase in charge, because he had no care beyond that of Cailte himself, from whom he took wages. The gilla comes to the stream, and takes Cailte’s cup from his back and drinks a drink of the stream. Whilst the gilla was thus drinking the eight great men went their way southward, mistaking the road, and the gilla following afterwards. Then was heard the noise of the large host, and the gilla proceeds to observe the multitude; bushes and a bank between them. He saw in the fore front of the crowd a strange band; it seemed to him one hundred and fifty were in this band. They appeared thus: robes of pure white linen upon them, a head chief with them, and bent standards in their hands; shields, broad‐streaked with gold and silver, bright shining on their breasts; their faces pale, pitiably feminine, and having masculine voices, and every man of them humming a march. The gilla followed his