Aristotle's Politics and Economics; Treatise on Rhetoric; Nicomachean Ethics; Organon, or Logical Treatises.

Aristotle's philosophical works covered an incredibly broad range of subjects including physics, biology, zoology, metaphysics, logic, ethics, rhetoric, politics and government; constituting the first comprehensive system of Western Philosophy. Through these many branches, Aristotle sought the universal; his aim was to discover the essential nature of being, becoming, existence and reality which he believed could be achieved through detailed systems of logic and classification. Aristotle’s works on natural history, particularly observations of the sea-life visible from the island of Lesbos, are some of the earliest known to have survived and include one of the earliest classification systems. Aristotle’s Metaphysics is considered to be his principal work as well as the first major work in metaphysical philosophy itself. “It forms the highest step in Aristotle’s system, and deals with the first principles of all existence. Here he grapples with the deepest questions of philosophy” (Peck, 130).