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This book puts forward a different approach to language change, the punctuated equilibrium model. This is based on the premise that during most of the 100,000 or more years that humans have had language, states of equilibrium have existed during which linguistic features diffused across the languages in a given area so that they gradually converged on a common prototype. From time to time, the state of equilibrium would be punctuated, with expansion and split of peoples and of languages, most recently, as a result of European colonisation and the globalisation of communication which are likely to result in the extinction, within the next hundred years, of 90% of the languages currently spoken. Professor Dixon suggests that every linguist should assume a responsibility for documenting some of these languages before they disappear.

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A typology is presented of parameters of variation associated with three main types of demonstratives: nominal (corresponding to demonstrative pronouns and demonstrative adjectives in traditional terminology), local adverbial and verbal. The paper surveys their basis characteristics; forms (including relationship to articles and interrogatives); deictic, syntactic, anaphoric and other functions; and types of reference — spatial, height and stance, visibility, etc. There is a case study of demonstratives in Dyirbal, and an array of questions which can usefully be pursued when investigating demonstratives in a given language.