can lay claim to an exclusive probability in its favour.

The Theaetetus is one of the narrated dialogues of Plato, and is the only
one which is supposed to have been written down. In a short introductory
scene, Euclides and Terpsion are described as meeting before the door of
Euclides' house in Megara. This may have been a spot familiar to Plato
(for Megara was within a walk of Athens), but no importance can be attached
to the accidental introduction of the founder of the Megarian philosophy.
The real intention of the preface is to create an interest about the person
of Theaetetus, who has just been carried up from the army at Corinth in a
dying state. The expectation of his death recalls the promise of his
youth, and especially the famous conversation which Socrates had with him
when he was quite young, a few days before his own trial and death, as we
are once more reminded at the end of the dialogue. Yet we may observe that
Plato has himself forgotten this, when he represents Euclides as from time
to time coming to Athens and correcting the copy from Socrates' own mouth.
The narrative, having introduced Theaetetus, and having guaranteed the
authenticity of the dialogue (compare Symposium, Phaedo, Parmenides), is
then dropped. No further use is made of the device. As Plato himself
remarks, who in this as in some other minute points is imitated by Cicero
(De Amicitia), the interlocutory words are omitted.

Theaetetus, the hero of the battle of Corinth and of the dialogue, is a
disciple of Theodorus, the great geometrician, whose science is thus
indicated to be the propaedeutic to philosophy. An interest has been
already excited about him by his approaching death, and now he is
introduced to us anew by the praises of his master Theodorus. He is a
youthful Socrates, and exhibits the same contrast of the fair soul and the
ungainly face and frame, the Silenus mask and the god within, which are
described in the Symposium. The picture which Theodorus gives of his