and the illustration
it supplies of Bacon's philosophy, it is
more interesting than either, for the insight
it affords of his labors, and of the numerous
obstacles he had to contend with in the execution
of his work. The first twenty chapters
detail various anecdotes of Bacon's personal
history, his opinions on the state of
education, the impediments thrown in his
way by the ignorance, the prejudices, the
contempt, the carelessness, the indifference
of his contemporaries. From the twentieth
chapter to the close of the volume he pursues
the thread of the Opus Majus, supplying what
he had there omitted, correcting and explaining
what had been less clearly or correctly
expressed in that or in the Opus Minus. In
Chapter LII. he apologizes for diverging from
the strict line he had originally marked out,
by inserting in the ten preceding chapters his
opinions on three abstruse subjects, Vacuum,
Motion, and Space, mainly in regard to their
spiritual significance. 'As these questions,'
he says,' are very perplexing and difficult, I
thought I would record what I had to say
about them in some one of my works. In the
Opus Majus and Opus Minus I had not studied
them sufficiently to prevail on myself to
commit my thoughts about them to writing;
and I was glad to omit them, owing to the
length of those works, and because I was
much hurried in their composition.' From the
fifty-second chapter to the close of the volume
he adheres to his subject without further digression,
but with so much vigor of thought
and freshness of observations, that, like the
Opus Minus, the Opus Tertium may be fairly
considered an independent work."--pp.
xliv-xlv.[13]

The details which Bacon gives of his personal history are of special
interest as throwing light upon the habits of life of a scholar in the
thirteenth century. Their autobiographic charm is increased by their
novelty, for they give a view of ways of life of which but few
particulars have been handed down.

Excusing himself for the delay which had occurred, after the reception
of the Pope's letter, before the transmission of the writings he had
desired, Bacon says that he was strictly prohibited by a rule of his
Order from communicating to others any writing made by one of its
members, under pena