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Published online by Cambridge University Press: 22 April 2026
The chief views requiring the Assumption’ of proto-language uniformity are evaluated. The conclusion is reached that the ‘assumption’ can usefully be replaced by (1) a hypothesis regarding the relation of the reconstructed phonemic system to that of some occurrent idiolect, and (2) an assumption regarding the interrelevance of non-irreconcilable reconstructions. In the course of developing the argument, the article touches on the law of the regularity of phonetic change, and proposes a definition of the comparative method.