Some of the linguistic changes which are crucial in the history of English and have traditionally been ascribed to Middle English can already be observed in late Northumbrian. One of these changes is the extension of genitive singular -es from the a-stems to other noun classes. Another is the spread of nominative/accusative plural -as from the masculine a-stems to the neuters and to other declensions. The aim of this article is to establish the actual scale on which these two interparadigmatic analogical changes are found in the glosses to the Lindisfarne Gospels and to the Durham Collectar, both dating from the tenth century.

The present study intends to shed more light on the process of morphological restructuring affecting the declensional system of late Northumbrian, and has three main aims: (a) to determine the pattern of dissemination of the innovative inflectional endings; (b) to establish which variables are significant in these analogical processes: declension, type and token frequency, grammatical context, Latin lemma, demarcation; and (c) to account for the different developmental tendencies of these two linguistic changes.