Semantic and soritical paradoxes challenge entrenched, fundamental principles about language - principles about truth, denotation, quantification and, among others, "tolerance". Study of the paradoxes helps us determine which logical principles are correct. So it is that they serve not only as a topic of philosophical enquiry but also as a constraint on such enquiry: they often dictate the semantic and logical limits of discourse in general. In this volume, 16 specially written essays by leading figures in the field offer new thoughts and arguments about the paradoxes.