In the last decade, there has been a revival of interest regarding negation and polarity, with much cross-fertilization between semantic and syntactic approaches. The papers in the present volume address key issues regarding the syntax and semantics of negation and polarity, including both synchronic and diachronic perpectives. Central to the discussions are the distribution of negative markers and the structure of the clause, negative concord phenomena, licensing of polarity items, similarities between Neg-movement and wh-movement. The papers, by main contributors to the field, reflect different theoretical frameworks, including Principles and Parameters and Minimalist approaches, Head-Driven Phrase Structure Grammar, Formal Semantics, or approaches interested in pragmatics. The volume is of interest to syntacticians, semanticians, historical linguists, typologists, and philosophers.