Now available from University Science Books at a much lower price, this classic textbook has never been rivaled. It is ideal for a senior or first-year graduate level courses. Statistical Mechanics is the extended version of McQuarrie's 1984 text -- Statistical Thermodynamics -- now out of print. Although our printing of this book carries a 2000 copyright date, this is not a new edition. It is the original first edition, without any changes to the text (except preface). Despite its age, it is still a renowned and accessible introduction to the subject, containing a large number of chapter-ending problems for students.