Preface; 1. The Parmenides; 2. The Theaetetus in the context of later dialogues; 3. Being and not-being in the Sophist; 4. The new dialectic: from the Phaedrus to the Philebus; 5. Philebus and the movement to cosmology; 6. Timaeus and the completion of the project: the recovery of the natural world; Epilogue: Plato as a political philosopher.