Published online by Cambridge University Press: 05 February 2009
It is a fundamental point of comparative and historical linguistics that genealogical affiliation can only be established on the basis of concrete linguistic features, the more central the feature the more important for classificatory purposes. While there is no absolute consensus about how a central linguistic feature be identified, it can be taken as axiomatic that long-term reconstruction and classification rests most fundamentally on phonological and morphological criteria. Of these two, Hetzron (1976b) has argued that it is the morphological which is the most important because morphology represents the level of grammar that is both more complex and more arbitrary in the sense that the sound-meaning dyad has no natural basis. Precisely this arbitrariness ensures that morphological correspondences are relatively unlikely to be due to chance.