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A SUFFICIENT reason for a new edition of Roger Bacon's principal work would be the extreme rarity of the edition of the Opus Jlazus published by febb in 1733, and reprinted seventeen years afterwards in Venice. But a more cogent reason ts that this edition is incomplete. The work, as we learn from Lacon's account of it in his Ofus Fertiuue, consisted of seven parts; and the seventh part, a discourse on Moral Philosophy, was omitted by the editor.
Why Jebb should have taken this course is not clear. In his preface he speaks of the work as con- sisting of six parts, ‘in sex partes distributum, and adds, ‘tractatum de Morali Philosophia ad caleem adjunnit.’ In 1858 a paper was read by Dr. Ingram before the Royal Trish Academy. and was printed in the seventh volume of the Proceedings of this institution, in which the writer showed conclusively the continuity of this seventh part of the Opus Afazgus with all that had gone before. The continuity is marked unmistakably in the very utle of the section, /uezpet seplima pars hugus persuasions de Morali Philosephia, and im its opening words, ‘Manifestavi in praecedentibus, &c. Repeated references to the foregoing parts will be found; and if
