Lucretius: On the Nature of Things
Plotinus: The Enneads

Aristotle: The Categories

The Categories is the first book of Aristotle's Organon, the collection of writings which founded the discipline of logic, and were central to philosophical education for centuries. Setting out to enumerate all the possible kinds of things which can be the subject or predicate of a proposition, Aristotle comes up with the ten concepts that give the book its title: substance, quantity, quality, relation, place, time, attitude, condition, action and affection.

Free online and downloadable texts

Gutenberg: The Categories, translated by E.M. Edgehill. Multiple formats.

Internet Archive: L 325 - The Categories and On Interpretation, translated by Harold P. Cook. Prior Analytics, translated by Hugh Tredennick. Greek and English Loeb edition. Multiple formats.

Classical Library: The Categories, translated by E.M. Edgehill. HTML file.

Internet Classics Archive: Categories, translated by E.M. Edgehill. HTML and text files.

University of Adelaide (Internet Archive): The Categories, translated by E.M. Edgehill. EPUB, HTML and MOBI formats.

Wikisource: Categories, translated by O.F. Owen (1853).

Other Resources

History of Philosophy without any gaps: Aristotle's Logical Works - podcast by philosopher Peter Adamson.

Librivox: The Categories - public domain audiobook.

Ontology.co: Semantics and Ontological Analysis in Aristotle's Categories.

Stanford Encyclopedia of Philosophy: Aristotle's Categories, by Paul Studtmann.

Stanford Encyclopedia of Philosophy: Aristotle's Logic, by Robin Smith.

Wikipedia: The Categories (Aristotle).

The Great Conversation: Further reading at Tom's Learning Notes

Aristotle's Organon: The Categories, On Interpretation, Prior Analytics, Posterior Analytics, Topics, and Sophistical Refutations.

Porphyry: Isagoge - an introduction to the Categories that strongly influenced the medieval reception of Aristotelian logic.

Ancient Greek resources: Learn to read Greek classics in the original.

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