Works on Moral and Metaphysical Philosophy,
by the same Author.

ESSAYS ON THE FORMATION AND PUBLICATION OF
OPINIONS, and on other Subjects.

ESSAYS ON THE PURSUIT OF
PROGRESS OF KNOWLEDGE.

Third Edition, 8vo.

TRUTH AND ON THE
Second Edition, 8vo.

8vo.

A REVIEW OF BERKELEY'S THEORY OF VISION, designed
to show the Unsoundness of that celebrated Speculation.
A LETTER TO A PHILOSOPHER, in reply to some recent Attempts
to vindicate Berkeley's Theory of Vision. (Pamphlet.)

Just Published by the same Author,

DISCOURSES ON VARIOUS SUBJECTS, read before Literary and
Philosophical Societies. 8vo. 8s. 6d. CONTENTS.-1. On the Mutual
Relations of the Sciences; 2. On the Mammoth or Fossil Elephant
discovered at the Mouth of the Lena; 3. On the Changes which have
taken place in the English Language, especially during the last Three
Centuries; 4. On the Science of Political Economy; 5. On the last
Reformation of the Calendar in England; 6. On the General Principles
of Physical Investigation; 7. On the Mechanical Causes of Thunder;
8. On the Paradoxes of Vision; 9. On the Theory of Wit.

LONDON:

SPOTTISWOODES and SHAW,
New-street-Square.

PREFACE

ΤΟ

THE SECOND EDITION.

A SECOND edition of the Theory of Reasoning having, very unexpectedly on the part of the Author, been called for, he cannot allow it to appear without acknowledging the favourable manner in which the work, notwithstanding its abstruseness and its contrariety to some existing opinions, has been received.

With regard to the present reprint, it is no more than due to the purchasers of the first edition to state that the alterations now introduced are almost entirely verbal ones, and not of material importance. No attempt, indeed, has been made to introduce any substantial changes.

The Author had so maturely considered, during many years, every part of the train of thought and almost every expression in which it was embodied, that the text of the first edition was as

complete as the powers of his mind enabled him at the time to make it; and he could not, consequently, expect to better it by any essential improvement in the short period which has since elapsed.

February 18. 1852.