Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The ms. Which comes next in importance I designate B. It is contained on pp. 57-61 of the vellum quarto classed Betham 145, belonging to the Royal Irish Academy. I am indebted to Mr. P. M. Macsweeney for a most accurate transcript of this ms. When I had an Opportunity of com paring his copy with the original, I found hardly any dis crepancies between the two. B was written in the fifteenth century, I think, by a scribe named Tornae, who, though he tells us in a marginal note1 that he had not for a long time had any practice in writing, did his task remarkably well. He modernises a good deal in spelling, but generally leaves the old-irish forms intact. Thus we owe to him the preservation of such original forms as the genitives fine (lat/w (8. Glam (3. Etc.