Abstract nouns, 60; definition of,
67.
Abstractions, hypostatising, 66.
Abstractly denominated principle,
fallacy of, 369.
Absurd questions, 208.
Absurdity as test of truth, 414.

Accent, fallacy of, 39, 43.

Accident, fallacy of, 42, 43.
Accidents, definition of, 50.
Accuracy, misplaced, 306.

Agreement, double method of, 277;
method of, 261 ff.

Ambiguities, 13 ff.; of quality and
quantity, 98.
Amphibology, 39, 42 n.
Analogy, argument from, 413;
false, 209.

Analysis, causal, 257; hexateuchal,
379.

Analytic propositions, 82.
Antecedent, 106, 270; denying
the, 185.

Appeal to consequences, 10.
Apperception, 412 n.
Apprehension, simple, 5 n.
Aquinas, Thos., 107.

Archimedes, 326.
Areolus, Petrus, 417 n.
'Argument', legal, 400 n.
Arguments, abbreviated, 188.
Argumentum ad hominem, 12, 201,
202; ad populum, 12, 201, 202;
ad rem, 12; ad verecundiam, 367.
Aristotle, 40 n., 83 n., 133 n., 176,

214, 420.
Arnold, Matthew, 42.
Authority, argument from, 367.
Authorship, joint, 378.
Averages, general, 312.

Illicit major, 158 n., 170, 174 n.
Illicit minor, 158 n., 170 n., 174 n.
Illusion, 91.

Inductio per enumerationem sim-
plicem, 251, 257.

Induction, 122; Aristotelian, 250;
certainty of, 226; distinguished
from deduction, 221; perfect,
227, 250.
Inference, 121; by added deter-
minants, 75; by privitive con-
ception, 130; data for, 270; im-
mediate, 131; in observation,
343; mediate, 145; real, 152.
Infima species, 50.
Infinitation, 130.
Innate principles, 230.
Intension, 61.

Interaction, 235; causal, 245.
Interest, errors due to, 302.
Interpretation, blunders of, 13.
Irrelevance, 198.

Method, indirect, of difference, 278;
joint, 275; of agreement, 264;
of concomitant variations, 290,
296; of difference, 261, 288; of
elimination, 254; of exhaustion,
250; of residues, 288; of statis-
tics, 296.

Methods, the four, 262.

Mill, J. S., 35, 83n., 107, 261,
262, 263, 278, 284, 287, 290 n.,
292, 295 n.

Minto, 20 n., 48 n., 64 n., 83 n.,
100 ff., 104 n., 186 n., 210 n.,
251 n., 262 n., 349 n., 369, 370.
Modus ponens, 183.

Modus tollens, 183.

Motet, 353.

Naming, use of, 55.

Neglected articulation, 212; as-
pect, 211; member, 215; whole,

219.
Newton, I., 244, 419
Nicolay, Col., 350.
Noetic relation, 82.
Non-observation, 348.
Non-sequitur, 195.
Nouns, common, 60.
Number, 85.

Object of thought, 3.

Objections, fallacy of, 220.
Observation, 343; unprejudiced,
347.

Obversion, 130.

Occam's razor, 417.

Opposite terms, 73.

Parsimony, law of, 418.
Permutation, 130.
Personal equation, 300
Petitio principii, 196.

Phrases, conventional, 36; uses
of, 56.

Plato, 133 n.

Pleadings, 400.

Post hoc, ergo propter hoc, 272
Powell, Baden, 223 n.
Precision, where needed, 34.
Preconception, errors of, 302.
Predicate, quantification of, 136.
Premise, 121; major, 150, 169;

minor, 150.
Probability, 330 ff.; as a test of
truth, 392; value of finding, 334.
Probable error, 328.
Proof, limits of, 423.
Proper nouns, 60.
Prophecy, 356.

Propositions, 2, 82; accidental, 82;
affirmative, 96; ampliative, 82;
analytic, 82; categorical, 106;
contradictory, 113, 114, 117;
contrary, 113, 114, 117; copu-
lative, 106n.; disjunctive, 106;
essential, 82; exceptive, 103,
115; exclusive, 103, 115; expli-
cative, 82; formal characteris-
tics of, 96; hypothetical, 106;
indefinite, 99; indesignate, 99;
modal, 85, 86; negative, 96,
106 n.; opposition of, III; par-
ticular, 96, 110 n.; preindesig-
nate, 99; pure, 85; real, 82;
remotive, 106 n.; singular, 96,
113 n.; subaltern, 114; subal-
ternate, 114; subcontrary, 114;
synthetic, 82; universal, 96, 109;
verbal, 82.
Propria, 50.
Prosyllogism, 189.

Quality, 96; undesignated, 99.
Quantity, 96, 97; double, 102; un-
designated, 99.

Reality, conception of, 91.
Reasoning, correct, 6; to the point,

12.

Reduction of oblique figures, 178.
References, fallacy of, 369.
Relations, combined, 84; denials
of, 89; five fundamental, 77;
how interwoven, 253.

Residues, method of, 288.

Schopenhauer, 76.

Science, and religion, 425; work
of, 244.

Selection, accidental, 304.
Sigwart, 79, 84.

Simplicity as test of truth, 405,
416, 421.
Socrates, 241.

Sorites, 188, 189.

Space, ideas of, 5; relation of, 80..
Species, 49.

Spencer, H., 15 n., 31, 89, 90.
Statements, interpretation of, 36.
Statistics, method of, 296.

Stephen, L., II.

Subject, and attribute, 78; of re-
lation, 87; of sentence, 3, 87;
of thought, 3.
Sui generis, 50.

Summum genus, 50.

Sumner, W. G., 21 n., 65 n., 215 n.,
216.

Syllogism, 145; figures of, 148;
disjunctive, 186; first figure of,
150; fourth figure of, 176; hypo-
thetical, 183; rules of, 177 n.;
second figure of, 162; third
figure of, 171.
Synthetic propositions, 82.

Tenterden, Lord, 43.

Terms, 56; absolute, 73; abstract,
65, 70; collective, 63; concrete,
65; connotative and non-conno-
tative, 60; contradictory, 73;
contrary, 73; contrapositive, 73;
correlative, 74; demonstrative,
58, 69 n.; descriptive, 69 n.;
distributed, 135; distributive, 63;
general, 61; negative, 71; oppo-
site, 73; paronymous, 28; posi-
tive, 71, 75; relative, 73, 74;
singular, 61.
Testimony, 363.
Thinking, clear, 2, 6; clear by
analysis, 259; hazy, 240; logi-
cal, 6; objective, 6; two kinds
of, I.
Thing, 233-4;

242.

permanence of,