Sextus Empiricus' Against the Physicists examines numerous topics central to ancient Greek inquiries into the nature of the physical world, covering subjects such as god, cause and effect, whole and part, bodies, place, motion, time, number, coming into being and perishing and is the most extensive surviving treatment of these topics by an ancient Greek sceptic. Sextus scrutinizes the theories of non-sceptical thinkers and generates suspension of judgement through the assembly of equally powerful opposing arguments. Richard Bett's edition provides crucial background information about the text and elucidation of difficult passages. His accurate and readable translation is supported by substantial interpretative aids, including a glossary and a list of parallel passages relating Against the Physicists to other works by Sextus. This is an indispensable edition for advanced students and scholars studying this important work by an influential philosopher.