have express testimony to the existence of contemporary writings bearing
the name of Alcibiades, we are compelled to suspend our judgment on the
genuineness of the extant dialogue.

Neither at this point, nor at any other, do we propose to draw an absolute
line of demarcation between genuine and spurious writings of Plato. They
fade off imperceptibly from one class to another. There may have been
degrees of genuineness in the dialogues themselves, as there are certainly
degrees of evidence by which they are supported. The traditions of the
oral discourses both of Socrates and Plato may have formed the basis of
semi-Platonic writings; some of them may be of the same mixed character
which is apparent in Aristotle and Hippocrates, although the form of them
is different. But the writings of Plato, unlike the writings of Aristotle,
seem never to have been confused with the writings of his disciples: this
was probably due to their definite form, and to their inimitable
excellence. The three dialogues which we have offered in the Appendix to
the criticism of the reader may be partly spurious and partly genuine; they
may be altogether spurious;--that is an alternative which must be frankly
admitted. Nor can we maintain of some other dialogues, such as the
Parmenides, and the Sophist, and Politicus, that no considerable objection
can be urged against them, though greatly overbalanced by the weight
(chiefly) of internal evidence in their favour. Nor, on the other hand,
can we exclude a bare possibility that some dialogues which are usually
rejected, such as the Greater Hippias and the Cleitophon, may be genuine.
The nature and object of these semi-Platonic writings require more careful
study and more comparison of them with one another, and with forged
writings in general, than they have yet received, before we can finally
decide on their character. We do not consider them all as genuine until
they can be proved to be spurious, as is often maintained and still more
often implied in this and similar discussions; but should say of some of