Abstract
Aristotle is presented, in this introduction to his work, as a scientist and a philosopher of science. This view is developed through the structure of the book, which emphasizes Aristotle's methodological concerns as a scientist, and through the no-nonsense interpretation of Aristotle's thought that it offers. Barnes particularly wants to impress on the reader the range of Aristotle's interests. He stresses that it is the empirical foundation of almost all the treatises that gives unity to their diversity.