Facsimile ed. "now for the first time published from the original manuscript in the library of the Royal Irish Academy."
A lithographic facsimile, produced under the supervision of Mr. Gilbert, printed from a transcript by Joseph O'Longan. The description of the ms., by Prof. O'Looney, is based mainly on the account compiled about 1843 by Eugene O'Curry; but two letters, here for the first time made known, help to complete the history of the book. cf. Pref. (signed: Samuel Ferguson.)
"Chiefly ... religious and devotional tracts. A compilation from various older books ... It is uncertain who the compiler was, but ... we may safely assume Leabhar breac to be the work of some one of the family of MacEgan."--Pref.
Part II includes an appendix.