I have further to explain how far I have received help from other labourers
in the same field. The books which I have found of most use are Steinhart
and Muller's German Translation of Plato with Introductions; Zeller's
'Philosophie der Griechen,' and 'Platonische Studien;' Susemihl's
'Genetische Entwickelung der Paltonischen Philosophie;' Hermann's
'Geschichte der Platonischen Philosophie;' Bonitz, 'Platonische Studien;'
Stallbaum's Notes and Introductions; Professor Campbell's editions of the
'Theaetetus,' the 'Sophist,' and the 'Politicus;' Professor Thompson's
'Phaedrus;' Th. Martin's 'Etudes sur le Timee;' Mr. Poste's edition and
translation of the 'Philebus;' the Translation of the 'Republic,' by
Messrs. Davies and Vaughan, and the Translation of the 'Gorgias,' by Mr.
Cope.

I have also derived much assistance from the great work of Mr. Grote, which
contains excellent analyses of the Dialogues, and is rich in original
thoughts and observations. I agree with him in rejecting as futile the
attempt of Schleiermacher and others to arrange the Dialogues of Plato into
a harmonious whole. Any such arrangement appears to me not only to be
unsupported by evidence, but to involve an anachronism in the history of
philosophy. There is a common spirit in the writings of Plato, but not a
unity of design in the whole, nor perhaps a perfect unity in any single
Dialogue. The hypothesis of a general plan which is worked out in the
successive Dialogues is an after-thought of the critics who have attributed
a system to writings belonging to an age when system had not as yet taken
possession of philosophy.

If Mr. Grote should do me the honour to read any portion of this work he
will probably remark that I have endeavoured to approach Plato from a point
of view which is opposed to his own. The aim of the Introductions in these