Of the first piece of this class mentioned by O'Curry, the Prayer of Saint Aireran, or Aileran the Wise, we hope to treat in a future number of this RECORD. "The second piece of this class", he continues, "is the Prayer or Invocation of _Colgu Na Duinechda_, a classical professor of Clonmacnoise, who died in the year 789". In the Martyrology of Donegal, just published by the Irish Archæological and Celtic Society, we find the following notice of the Author of this prayer on the 20th of February, the 10th of the Kalends of March: "COLGA, Mac Ua Duinechda,[1] _i.e._ Lector of Cluan-mac-nois. It was he that composed the kind of prayer, called the #Surab Crabhaidh#.[2] It was to him Paul the Apostle came to converse with him, and to help him on his road, and he took his satchel of books at Moin-tire-an-áis, and it was he that pleaded for him to the school of Cluain-mac-Nois, and the prologue or preface which is before that prayer states that this Colga was a saint, was a priest, and was a scribe of the saints of Erin, etc. And there is a Saint Colga, with his pedigree, among the race of Dathi, son of Fiachra, son of Eochaidh Muidhmhedhoin, and he may perhaps be this Colga". [1] Dr. Todd, one of the learned editors, here adds a note: "_Duinechda._ The later hand inserts here: Marian. vocat. #Caolcu#, Marianus O'Gorman calls him #Caolchu#". But in the Brussels MS. of M. O'Gorman, as copied by Mr. O'Curry, the name is written #Colchu#. [2] That is the Besom or Broom of Devotion. See Colgan, Acta SS. p. 378. Through the gracious permission of their Lordships the Board of the Catholic University, who have placed at our disposal the manuscripts belonging to the late lamented Mr. O'Curry, now in possession of the University, we are enabled to give our readers this interesting and valuable document. In doing so we do not pretend to enter on a critical or philological examination of it. We shall confine ourselves to some remarks on those points which seem most interesting to ecclesiastics.