PREFACE.

THE origin and design of the following Treatise
being fully set forth in the Introductory Letter,
it remains only to say that the discussions
contained in the volume form a series, which
(should the casualties of life permit) will be
probably followed at no distant time by another
or others on kindred topics.

A cursory inspection of the Table of Contents
will show that the author has not yet touched
upon a number of related questions of an in-
teresting character, and presenting a wide field
for free investigation. On some of these he

hopes, sooner or later, to be able to state the
views which a long and patient consideration

of them has suggested to his mind.

Norbury, near Sheffield, Feb. 20th, 1855.

CONTENTS.

LETTER

I. Origin and Design of the present

Series of Letters

II. Methods of investigating and speaking

of the Facts of Consciousness

III. Personification of the Faculties

IV. Figurative Language in Philosophical

Inquiries

V. Imaginary Mental Transactions

VI.

Page

1

9

14

Classification of the Phenomena of

Consciousness

VII. Sensitive Affections

VIII. Intellectual Operations: Discerning

and Conceiving

IX. Intellectual Operations continued: Be-

lieving and Reasoning

X. Willing

XI. The alleged Faculties of Reason and

Understanding

XII. Ambiguity of certain Terms

XIII. Theories of Perception

54

60

75

92

103

- 109

LETTER

XIV. Theories of Perception continued:

Locke

XV. Theories of Perception continued:

XVII. Theories of Perception continued:

Berkeley, Hume, and Brown

Page

- 115

124

-

- 134

XVIII. Theories of Perception continued:

Hobbes, D'Alembert, and Stewart

142

154

166

- 172

- 179

- 186