The texts that treat of theology, mysticism, lives of saints, and martyrologies, are very numerous; those of law few. Medicine figures in a class apart. Astronomy gets even a smaller place than medicine. Its most ancient monument dates from the fourteenth century. One of the most curious and least known of all the Gaelic relics is a treatise on Gaelic grammar, written in Gaelic. It is divided into four books, and is preserved to us in ten MSS. of the fourteenth, fifteenth, and sixteenth centuries. The four books of which it is composed are attributed, the first to Cennfaelad, an historic personage who died in 678; the other three to mythical, prehistoric authors, such as Fercertné, Amergin Glûngel, and Fenius Farsaid. The antiquity and ability of the latter grammarian for the work, may be inferred from the somewhat startling statement that he is said to have composed the Gaelic tongue out of seventy-two languages, and afterwards his son Nial visited Egypt to teach the languages after the confusion of Babel. Verily the Celts were an enterprising race to have a grammarian first in the field, and the nebulous Fenius Farsaid deserves a grave as high as Browning’s hero, for even before Moses “ground he at grammar.” It is a pity that this rare old treatise which Ireland possessed in the Middle Ages has not been published. The MSS. are in the British Museum, Royal Academy of Ireland, Trinity College, and with the Franciscans of Dublin. But not in any of the above-named categories do we find the body and soul of Celtic literature. The real breathing spirit of the past speaks to us rather in the great MSS. of the Middle Ages, those which deal with romance and history—the earlier sagas and the later annals; and these deserve more than a passing reference. The saga or heroic literature is far and away the most curious and abundant. De Jubainville himself chronicles no less than 540 pieces of this class. But its greatest monuments are the miscellaneous MSS. known as the Leabhar Na h’Uidhre, the Book of Leinster, Book of Ballymote, Book of Lecain, and Book of Lismore.