The chapters in this volume address the process of syntactic change at different granularities. The language-particular component of a grammar is now usually assumed to be nothing more than the specification of the grammatical properties of a set of lexical items. Accordingly, grammar change must reduce to lexical change. And yet these micro-changes can cumulatively alter the typological character of a language (a macro-change). A central puzzle in diachronic syntax is how to relate macro-changes to micro-changes. Several chapters in this volume describe specific micro-changes: changes in the...