The texts edited in this volume are Ælfric's vernacular versions of two highly influential early medieval ethical treatises. The first, _De duodecim abusiuis_, is his Old English version of a seventh-century Hiberno-Latin tract dealing with the twelve abuses of the world. The second, _De octo uitiis et de duodecim abusiuis_, is a composite text; it combines a treatment of the eight vices and the complementary eight virtues, also found as the lastpart of Ælfric's _Lives of Saints_ XVI, with the twelve abuses. The main source for the virtues and vices is Alcuin's ninth-century _De uirtutibus et uitiis_. Both texts were composed in Ælfric's hallmark rhythmical, alliterative prose. This new edition provides, for the first time, critical editions of both texts, with a facing translation, presented with full apparatus; it also includes an extensive discussion of the sources and how theyare treated. MARY CLAYTON is Professor of Old and Middle English, University College Dublin.