and the difficulties and persecutions he had to surmount from the
jealousies and suspicions of his less-enlightened contemporaries and
rivals. The _Opus Tertium_, according to the sketch given of its
contents by Bacon himself, is not complete either in the Douay MS. or in
that in the British Museum, several subjects being left out; and, among
others, that of Moral Philosophy. This deficiency may arise, either from
Bacon not having completed his original design, or from no complete MS.
of this portion of his writings having yet been discovered. M. Cousin
says, that the _Opus Tertium_, as well as the _Opus Minus_, is still
inedited; and is only known by what Jebb has said of it in his preface
to the _Opus Majus_. Jebb quotes it from a copy in the Cottonian
Library, now in the British Museum; and it was not known that there was
a copy in France, till M. Cousin was led to the discovery of one, by
observing in the Catalogue of the public library of Douay, a small MS.
in 4to. with the following title, _Rog. Baconis Grammatica Græca_.
Accustomed to suspect the accuracy of such titles to MSS., M. Cousin
caused a strict examination of the MS. to be made, when the discovery
was communicated to him that only the first part of the MS. consisted of
a Greek grammar, and that the remaining portion, which the compiler of
the Catalogue had not taken the trouble to examine, consisted of many
fragments of other works of Bacon, and a copy of the _Opus Tertium_.
This copy of the _Opus Tertium_ is imperfect, but fortunately the
deficiencies are made up by the British Museum copy, which M. Cousin
examined, and which also contains a valuable addition to Chapter I., and
a number of good readings.

The _Opus Majus_, as published by Jebb, contains but six parts; but the
work in its complete state had originally a seventh part, containing
Moral Philosophy, which was reproduced, in an abridged and improved
state, by the renowned author, in the _Opus Tertium_. This is now