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EPISTEMOLOGY
 
THEORY OF
KNOWLEDGE 
 
BY THE SAME
AUTHOR 
 
THE SCIENCE
OF LOGIC. An Inquiry into the 
Principles
of Accurate Thought and Scientific 
Method. 2
vols. Svo. Vol. I. Conception, Judg 
ment, and
Inference. 75. 6<1. net. Vol. II. 
Method,
Science, and Certitude. 7s. f>d. net. 
 
ONTOLOGY,
or the Theory of Being. An Intro 
duction to
General Metaphysics. 8vo, IDS. 6d. net. 
 
HISTORY OF
MEDIEVAL PHILOSOPHY. By 
M. DE
WUI.F, LL.D., Ph.D., D.Litt., Professor at 
the
University of Louvain. Translated by P. 
COFFEY,
Ph.D. 8vo, 105. 6d. net. 
 
SCHOLASTICISM
OLD AND NEW. An Intro 
duction to
Scholastic Philosophy, Medieval and 
Modern. By
M. DE WULF. Translated by P. 
COFFKY,
Ph.D. Svo, 6s. net. 
 
LONGMANS,
GREEN AND CO. 
 
LONDON, NEW
YORK, BOMBAY, CALCUTTA, AND MADRAS 
 
E P I S T E
M O L O G Y 
 
OR THE 
 
THEORY OF
KNOWLEDGE 
 
AN
INTRODUCTION TO GENERAL METAPHYSICS 
 
P. COFFEY,
PH.D. (LOUVAIN) 
 
PROFESSOR
OF LOGIC AND METAPHYSICS, MAYNOOTH COLLEGE, IRELAND 
 
IN TWO
VOLUMES 
VOL. II 
 
PART IV.
THE DATA OF INTELLECTUAL KNOWLEDGE ; 
SENSE
PERCEPTION 
 
PART V.
TRUTH AND CERTITUDE: THEIR CRITERIA 
AND MOTIVES
 
LONGMANS,
GREEN AND CO. 
 
39
PATERNOSTER ROW, LONDON 
 
FOURTH
AVENUE & 30TH STREET, NEW YORK 
 
BOMBAY,
CALCUTTA," AJ\ T D MADRAS 
 
1917 
 
CONTENTS OF
VOLUME II. 
 
PART IV. 
 
THE DATA OF
INTELLECTUAL KNOWLEDGE ; SENSE 
PERCEPTION.
 
CHAPTER
XIII. 
SELF-CONSCIOUSNESS
AND MEMORY. 
 
PAGE 
 
95.
Transition to Sense Perception. Terms and Distinctions ... i 
 
96. Data,
Interpretations, and Implications of Consciousness ... 2 
 
97. Truths
Revealed by Introspective Rational Analysis of the Data of 
 
Consciousness
5 
 
98. Memory,
Self-Identity, and Time Duration 10 
 
99. Truths
Revealed by Introspective Rational Analysis of the Data of 
 
Memory 12 
 
100.
Consciousness of Self and Cognition of the External Universe . . 15 
 
CHAPTER
XIV. 
 
EXTRAMENTAL
REALITY. THE EXTERNAL UNIVERSE. 
 
101.
Reality of the Cognitive Acts or States of the " Ego," compared with 
 
Reality of
their Objects 19 
 
102. Is the
Reality (" Esse ") of Conscious States Identical with their Ap 
 
prehension
(" Percipi ")? ......... 21 
 
103.
Alternative Methods of Justifying Spontaneous Belief in the Existence 
 
of an External
Material Universe. (A) Transition Effected by Appeal 
 
to the
Principle of Causality 24 
 
104.
Criticism of First Alternative 26 
 
105. (B)
Spontaneous Conviction of the Existence of an External Material 
 
Universe
Rationally Justified by Intellectual Reflection on the 
Nature and
Characteristics of External Sense Data . .31 
 
CHAPTER XV.
 
VALIDITY OF
SENSE PERCEPTION : REAL EXISTENCE OF AN EXTERNAL, MATERIAL 
 
UNIVERSE. 
 
106. The
Facts of Sense Perception .."""." 37 
 
107. Their
Psychological Explanation and their Significance for Epistemology 39 
 
108. The
Problems and the Theories 41 
 
vi TABLE OF
CONTENTS 
 
PAGE 
 
109. Direct
Vindication of Belief in the Real Existence of a Mind-Independent, 
 
External,
Extended, Material Universe ...... 44 
 
no.
Solution of the General "A Priori" Difficulty of Idealism against
this 
 
Belief 46 
 
ni.
Indirect Confirmation of this Belief by Appeal to the Principle of 
 
Causality
51 
 
CHAPTER
XVI. 
PERCEPTION
OF SENSE QUALITIES. 
 
112. Two
Realist Theories of Sense Perception 64 
 
113. Their
Bearing on the Problem of its Validity 69 
 
114.
Relation of "Proper" and "Common" Sensibles, of "
Sensibilia per 
 
se"
and " Sensibilia per accidens," to Intellect .... 75 
 
115.
Extramental Reality of the " Common" Sensibles, or "
Primary" Sense 
 
Qualities,
Vindicated ......... 81 
 
116.
Distinction of the Perceiver s Organism or Body from the External 
 
Universe
............ 86 
 
CHAPTER
XVII. 
RELATIVITY
OF SENSE QUALITIES TO PERCEIVER. 
 
117. Role
of Perceiver s Organism as Partial Determinant of "External" 
 
Sense
Qualities .......... 89 
 
118.
Relativity of External Sense Qualities to Perceiver s Organism. Sense 
 
Illusions
and Deceptions. " Infallibility " of Perception . . . 91 
 
ng.
Conditions of " Normal " and " Abnormal " Sense Perception
. . 95 
 
120.
Epistemological Import of the Distinction ...... 97 
 
121. The
Nature of External Sense Perception Involves Relativity of all Ex 
 
ternal
Sense Qualities (including Concrete Externality itself) to 
Perceiver s
Organism ......... 99 
 
CHAPTER
XVIII. 
 
EXTERNAL
REALITY OF ALL SENSE QUALITIES VINDICATED. " HYPERPHYSICAL 
IDEALISM"
AND "PHYSICAL REALISM". 
 
 
with
External Reality of Sense Qualities ...... 104 
 
123.
Secondary Sense Qualities are no less Externally Real and no more De 
 
pendent on
Perceiver for what they are Perceived to be, than Primary 
Qualities.
Berkeley s Immaterialism 107 
 
124.
Physical Science and the Sense Qualities. Presuppositions of Scientific 
 
Theories.
Physical Realism 124 
 
CHAPTER
XIX. 
SUBJECTIVE
IDEALISM, INFERENTIAL REALISM, AND INTUITIVE REALISM. 
 
125.
Idealism and the Sense Qualities : Abuse of " Inference by
Similarity" 
 
from "
Representations " 139 
 
126.
General Difficulties against Critical Perceptionism ..... 151 
 
127. The
Main Difficulty 159 
 
TABLE OF
CONTENTS vii 
 
CHAPTER XX.
IDEALISM
AND THE DISTINCTION BETWEEN "APPEARANCE" AND "REALITY". 
 
PAGE 
 
128.
Analysis of the Distinction between what Things " Are" and what they 
 
"
Appear " . 167 
 
129. How
Kant derives Two " Things " from One " Appearing Thing " .
177 
 
CHAPTER XXI.
KANT S
THEORY OF SENSE PERCEPTION, SPACE AND TIME. 
 
130.
General View of Kant s Doctrine of Sense Perception .... 184 
 
131. Kant s
Account of " Forms of Intuition " Confused and Ambiguous . 187 
 
132. Space
not an " A Priori " Perception. Analysis of Kant s Arguments . 190 
 
133. Space
not a Property of Mere Mental Appearances or Phenomena, but 
 
of Material
Realities 196 
 
134. Kant s
Doctrine of Time as an " A Priori " Form of " Internal "
Per 
 
ception 202
 
PART V. 
TRUTH AND
CERTITUDE : THEIR CRITERIA AND MOTIVES. 
 
CHAPTER
XXII. 
RETROSPECT.
RELATIVIST THEORIES OF KNOWLEDGE. 
 
135. The
Relativity of Knowledge. True and False Relativisms . . . 208 
 
136.
Epistemological Significance of Distinction Between Sense and Intellect 212 
 
137.
Validity of Concepts Reviewed 216 
 
138. Truth
of Contingent Judgments Absolute 219 
 
139. Truth
of Necessary Judgments Absolute 222 
 
140. Some
Relativist Difficulties 225 
 
141.
Scholasticism and Kantian Relativism . , 228 
 
142. The
Evolutionary Form of Relativism 232 
 
143. Truths
Overlooked or Perverted in the Evolutionary Theory . . . 235 
 
144.
Criticism of the Theory 238 
 
CHAPTER
XXIII. 
TRUTH AND
EVIDENCE. 
 
145.
Objectivity and Truth 245 
 
146.
Definition of Truth 248 
 
147. The
Objective Term of the Truth-Relation is Extramental, Real and 
 
Attainable
251 
 
148.
Criteria of Truth and Motives of Certitude 255 
 
149.
Evidence as the Supreme Criterion of Truth and the Ultimate Motive 
 
of
Certitude 261 
 
150. Application
of the Doctrine to Mediate Evidence 263 
 
151.
Application to Immediate Sense Evidence ...... 265 
 
152.
Application to Immediate Evidence of Principles of the Ideal Order . 271 
 
153. "
Testing " Evidence. Infallibility of Intellect 273 
 
154.
Reflection Shows the Cogent Evidence for Spontaneous Assents to be 
 
Sufficient
Evidence for Reasoned Certitude 277 
 
viii TABLE
OF CONTENTS 
 
CHAPTER
XXIV. 
OTHER
INTELLECTUALIST THEORIES OF CERTITUDE. TRADITIONALISM. 
 
PAGE 
 
155. Other
Tests. Spencer. Descartes. Circular Theories . . . 281 
 
156.
Consistency as a Test of Truth. Relativist and Hegelian Conceptions 
 
of Truth as
Consistency 284 
 
157.
Fideism : Historical Causes ......... 290 
 
158.
Exposition of Traditionalist Theories ....... 293 
 
159.
General Criticism of Traditionalist Theories 298 
 
160.
Examination of De Donald s Theory ....... 300 
 
161. Theory
of De Lamennais Examined. General Assent as a Test of 
 
Truth 303 
 
162.
"Common Sense" as a Criterion: the Scottish School. Natural In 
 
telligence
and Concrete Evidence ....... 307 
 
163.
Modified Traditionalism. Its Soul of Truth. Traditionalism, Rational 
 
ism, and
Catholic Teaching 311 
 
CHAPTER
XXV. 
 
ANTI-!NTELLECTUALIST
THEORIES. KANT S MORAL DOGMATISM. PRAGMATISM 
 
AND
HUMANISM. 
 
164. Some
Illustrations of Anti-Intellectualibt Theories ol Certitude. General 
 
Argument
against Sentimentalist and Voluntarist Theories . . 318 
 
165.
Voluntarist Objections. Misconception of Intellectualism . . . 322 
 
166. Kant s
Moral Dogmatism of the Practical Reason. .... 326 
 
167.
Critique of Moral Dogmatism. The " Categorical Imperative " and its 
 
Implications
........... 330 
 
iG8. The
Two Critiques Compared. Inconsistencies of Kant s System as a 
 
Whole 336 
 
169. Later
Anti-Intellectualist Theories: Social Dogmatism. Christian 
 
Apologetics
344 
 
170.
Outline of Pragmatism and Humanism ....... 353 
 
171.
General Arguments against Pragmatism 357 
 
172. The
Pragmatist Criterion Examined. Special Argument Outlined . 359 
 
173.
Conclusion. Possibility and Sources of Error. The Problems of 
 
Epistemology
........... 366 
 
INDEX 373 
 
PART IV. 
 
THE DATA OF
INTELLECTUAL KNOWLEDGE ; SENSE 
PERCEPTION.
 
CHAPTER
XIII. 
SELF-CONSCIOUSNESS
AND MEMORY. 
 
EPISTEMOLOGY
 
THEORY OF
KNOWLEDGE 
 
BY THE SAME
AUTHOR 
 
THE SCIENCE
OF LOGIC. An Inquiry into the 
Principles
of Accurate Thought and Scientific 
Method. 2
vols. Svo. Vol. I. Conception, Judg 
ment, and
Inference. 75. 6<1. net. Vol. II. 
Method,
Science, and Certitude. 7s. f>d. net. 
 
ONTOLOGY,
or the Theory of Being. An Intro 
duction to
General Metaphysics. 8vo, IDS. 6d. net. 
 
HISTORY OF
MEDIEVAL PHILOSOPHY. By 
M. DE
WUI.F, LL.D., Ph.D., D.Litt., Professor at 
the
University of Louvain. Translated by P. 
COFFEY,
Ph.D. 8vo, 105. 6d. net. 
 
SCHOLASTICISM
OLD AND NEW. An Intro 
duction to
Scholastic Philosophy, Medieval and 
Modern. By
M. DE WULF. Translated by P. 
COFFKY,
Ph.D. Svo, 6s. net. 
 
LONGMANS,
GREEN AND CO. 
 
LONDON, NEW
YORK, BOMBAY, CALCUTTA, AND MADRAS 
 
E P I S T E
M O L O G Y 
 
OR THE 
 
THEORY OF
KNOWLEDGE 
 
AN
INTRODUCTION TO GENERAL METAPHYSICS 
 
P. COFFEY,
PH.D. (LOUVAIN) 
 
PROFESSOR
OF LOGIC AND METAPHYSICS, MAYNOOTH COLLEGE, IRELAND 
 
IN TWO
VOLUMES 
VOL. II 
 
PART IV.
THE DATA OF INTELLECTUAL KNOWLEDGE ; 
SENSE
PERCEPTION 
 
PART V.
TRUTH AND CERTITUDE: THEIR CRITERIA 
AND MOTIVES
 
LONGMANS,
GREEN AND CO. 
 
39
PATERNOSTER ROW, LONDON 
 
FOURTH
AVENUE & 30TH STREET, NEW YORK 
 
BOMBAY,
CALCUTTA," AJ\ T D MADRAS 
 
1917 
 
CONTENTS OF
VOLUME II. 
 
PART IV. 
 
THE DATA OF
INTELLECTUAL KNOWLEDGE ; SENSE 
PERCEPTION.
 
CHAPTER
XIII. 
SELF-CONSCIOUSNESS
AND MEMORY. 
 
PAGE 
 
95.
Transition to Sense Perception. Terms and Distinctions ... i 
 
96. Data,
Interpretations, and Implications of Consciousness ... 2 
 
97. Truths
Revealed by Introspective Rational Analysis of the Data of 
 
Consciousness
5 
 
98. Memory,
Self-Identity, and Time Duration 10 
 
99. Truths
Revealed by Introspective Rational Analysis of the Data of 
 
Memory 12 
 
100.
Consciousness of Self and Cognition of the External Universe . . 15 
 
CHAPTER
XIV. 
 
EXTRAMENTAL
REALITY. THE EXTERNAL UNIVERSE. 
 
101.
Reality of the Cognitive Acts or States of the " Ego," compared with 
 
Reality of
their Objects 19 
 
102. Is the
Reality (" Esse ") of Conscious States Identical with their Ap 
 
prehension
(" Percipi ")? ......... 21 
 
103.
Alternative Methods of Justifying Spontaneous Belief in the Existence 
 
of an External
Material Universe. (A) Transition Effected by Appeal 
 
to the
Principle of Causality 24 
 
104.
Criticism of First Alternative 26 
 
105. (B)
Spontaneous Conviction of the Existence of an External Material 
 
Universe
Rationally Justified by Intellectual Reflection on the 
Nature and
Characteristics of External Sense Data . .31 
 
CHAPTER XV.
 
VALIDITY OF
SENSE PERCEPTION : REAL EXISTENCE OF AN EXTERNAL, MATERIAL 
 
UNIVERSE. 
 
106. The
Facts of Sense Perception .."""." 37 
 
107. Their
Psychological Explanation and their Significance for Epistemology 39 
 
108. The
Problems and the Theories 41 
 
vi TABLE OF
CONTENTS 
 
PAGE 
 
109. Direct
Vindication of Belief in the Real Existence of a Mind-Independent, 
 
External,
Extended, Material Universe ...... 44 
 
no.
Solution of the General "A Priori" Difficulty of Idealism against
this 
 
Belief 46 
 
ni.
Indirect Confirmation of this Belief by Appeal to the Principle of 
 
Causality
51 
 
CHAPTER
XVI. 
PERCEPTION
OF SENSE QUALITIES. 
 
112. Two
Realist Theories of Sense Perception 64 
 
113. Their
Bearing on the Problem of its Validity 69 
 
114.
Relation of "Proper" and "Common" Sensibles, of "
Sensibilia per 
 
se"
and " Sensibilia per accidens," to Intellect .... 75 
 
115.
Extramental Reality of the " Common" Sensibles, or "
Primary" Sense 
 
Qualities,
Vindicated ......... 81 
 
116.
Distinction of the Perceiver s Organism or Body from the External 
 
Universe
............ 86 
 
CHAPTER
XVII. 
RELATIVITY
OF SENSE QUALITIES TO PERCEIVER. 
 
117. Role
of Perceiver s Organism as Partial Determinant of "External" 
 
Sense
Qualities .......... 89 
 
118.
Relativity of External Sense Qualities to Perceiver s Organism. Sense 
 
Illusions
and Deceptions. " Infallibility " of Perception . . . 91 
 
ng.
Conditions of " Normal " and " Abnormal " Sense Perception
. . 95 
 
120.
Epistemological Import of the Distinction ...... 97 
 
121. The
Nature of External Sense Perception Involves Relativity of all Ex 
 
ternal
Sense Qualities (including Concrete Externality itself) to 
Perceiver s
Organism ......... 99 
 
CHAPTER
XVIII. 
 
EXTERNAL
REALITY OF ALL SENSE QUALITIES VINDICATED. " HYPERPHYSICAL 
IDEALISM"
AND "PHYSICAL REALISM". 
 
 
with
External Reality of Sense Qualities ...... 104 
 
123.
Secondary Sense Qualities are no less Externally Real and no more De 
 
pendent on
Perceiver for what they are Perceived to be, than Primary 
Qualities.
Berkeley s Immaterialism 107 
 
124.
Physical Science and the Sense Qualities. Presuppositions of Scientific 
 
Theories.
Physical Realism 124 
 
CHAPTER
XIX. 
SUBJECTIVE
IDEALISM, INFERENTIAL REALISM, AND INTUITIVE REALISM. 
 
125.
Idealism and the Sense Qualities : Abuse of " Inference by
Similarity" 
 
from "
Representations " 139 
 
126.
General Difficulties against Critical Perceptionism ..... 151 
 
127. The
Main Difficulty 159 
 
TABLE OF
CONTENTS vii 
 
CHAPTER XX.
IDEALISM
AND THE DISTINCTION BETWEEN "APPEARANCE" AND "REALITY". 
 
PAGE 
 
128.
Analysis of the Distinction between what Things " Are" and what they 
 
"
Appear " . 167 
 
129. How
Kant derives Two " Things " from One " Appearing Thing " .
177 
 
CHAPTER XXI.
KANT S
THEORY OF SENSE PERCEPTION, SPACE AND TIME. 
 
130.
General View of Kant s Doctrine of Sense Perception .... 184 
 
131. Kant s
Account of " Forms of Intuition " Confused and Ambiguous . 187 
 
132. Space
not an " A Priori " Perception. Analysis of Kant s Arguments . 190 
 
133. Space
not a Property of Mere Mental Appearances or Phenomena, but 
 
of Material
Realities 196 
 
134. Kant s
Doctrine of Time as an " A Priori " Form of " Internal "
Per 
 
ception 202
 
PART V. 
TRUTH AND
CERTITUDE : THEIR CRITERIA AND MOTIVES. 
 
CHAPTER
XXII. 
RETROSPECT.
RELATIVIST THEORIES OF KNOWLEDGE. 
 
135. The
Relativity of Knowledge. True and False Relativisms . . . 208 
 
136.
Epistemological Significance of Distinction Between Sense and Intellect 212 
 
137.
Validity of Concepts Reviewed 216 
 
138. Truth
of Contingent Judgments Absolute 219 
 
139. Truth
of Necessary Judgments Absolute 222 
 
140. Some
Relativist Difficulties 225 
 
141.
Scholasticism and Kantian Relativism . , 228 
 
142. The
Evolutionary Form of Relativism 232 
 
143. Truths
Overlooked or Perverted in the Evolutionary Theory . . . 235 
 
144.
Criticism of the Theory 238 
 
CHAPTER
XXIII. 
TRUTH AND
EVIDENCE. 
 
145.
Objectivity and Truth 245 
 
146.
Definition of Truth 248 
 
147. The
Objective Term of the Truth-Relation is Extramental, Real and 
 
Attainable
251 
 
148.
Criteria of Truth and Motives of Certitude 255 
 
149.
Evidence as the Supreme Criterion of Truth and the Ultimate Motive 
 
of
Certitude 261 
 
150. Application
of the Doctrine to Mediate Evidence 263 
 
151.
Application to Immediate Sense Evidence ...... 265 
 
152.
Application to Immediate Evidence of Principles of the Ideal Order . 271 
 
153. "
Testing " Evidence. Infallibility of Intellect 273 
 
154.
Reflection Shows the Cogent Evidence for Spontaneous Assents to be 
 
Sufficient
Evidence for Reasoned Certitude 277 
 
viii TABLE
OF CONTENTS 
 
CHAPTER
XXIV. 
OTHER
INTELLECTUALIST THEORIES OF CERTITUDE. TRADITIONALISM. 
 
PAGE 
 
155. Other
Tests. Spencer. Descartes. Circular Theories . . . 281 
 
156.
Consistency as a Test of Truth. Relativist and Hegelian Conceptions 
 
of Truth as
Consistency 284 
 
157.
Fideism : Historical Causes ......... 290 
 
158.
Exposition of Traditionalist Theories ....... 293 
 
159.
General Criticism of Traditionalist Theories 298 
 
160.
Examination of De Donald s Theory ....... 300 
 
161. Theory
of De Lamennais Examined. General Assent as a Test of 
 
Truth 303 
 
162.
"Common Sense" as a Criterion: the Scottish School. Natural In 
 
telligence
and Concrete Evidence ....... 307 
 
163.
Modified Traditionalism. Its Soul of Truth. Traditionalism, Rational 
 
ism, and
Catholic Teaching 311 
 
CHAPTER
XXV. 
 
ANTI-!NTELLECTUALIST
THEORIES. KANT S MORAL DOGMATISM. PRAGMATISM 
 
AND
HUMANISM. 
 
164. Some
Illustrations of Anti-Intellectualibt Theories ol Certitude. General 
 
Argument
against Sentimentalist and Voluntarist Theories . . 318 
 
165.
Voluntarist Objections. Misconception of Intellectualism . . . 322 
 
166. Kant s
Moral Dogmatism of the Practical Reason. .... 326 
 
167.
Critique of Moral Dogmatism. The " Categorical Imperative " and its 
 
Implications
........... 330 
 
iG8. The
Two Critiques Compared. Inconsistencies of Kant s System as a 
 
Whole 336 
 
169. Later
Anti-Intellectualist Theories: Social Dogmatism. Christian 
 
Apologetics
344 
 
170.
Outline of Pragmatism and Humanism ....... 353 
 
171.
General Arguments against Pragmatism 357 
 
172. The
Pragmatist Criterion Examined. Special Argument Outlined . 359 
 
173.
Conclusion. Possibility and Sources of Error. The Problems of 
 
Epistemology
........... 366 
 
INDEX 373 
 
PART IV. 
 
THE DATA OF
INTELLECTUAL KNOWLEDGE ; SENSE 
PERCEPTION.
 
CHAPTER
XIII. 
SELF-CONSCIOUSNESS
AND MEMORY.