Polymers are very large molecules consisting of many atoms covalently bonded like a chain. Their structure gives unique physical properties to polymer solutions. This outstanding textbook gives a clear and concise introduction to the modern theory of polymer physics. It describes basic concepts and methods and explains the statistical properties of the assembly of chain-like molecules; topics include scaling theory, concentration fluctuation, gels, and reptation. This is an ideal volume for graduate students and advanced undergraduates in polymer physics.