I. The theory of recollection: Socratic doctrine in the early Dialogues -- The Meno -- The Phaedo -- II. The criticism of perception: Introductions -- The Symposium -- The Republic -- The Cratylus -- The Theaetetus -- III. Knowledge and belief: Recollection and the new method of Dialectic -- The evaluation of perception in Plato's later theory -- Knowledge and belief in the Timaeus -- The Sophist's account of statement and belief -- IV> Mathematical knowledge: Mathematics in the natural sciences -- Mathematics and the forms -- The objects of mathematical knowledge -- Conclusions