 We may say that the Physics, which is the first and the longest treatise on natural philosophy (184a–267b in Bekker’s numbering) contains a number of Aristotelian books that deal with key issues of this science, but Averroes was not aware of this fact that modern research has brought to light. His work was based on the belief in the unity of the treatise, so that he always strove for a coherent, unified reading and interpretation of Aristotle.