(p. 64)
Sec.5. As to Modality 66
Sec.6. Verbal and Real Propositions 67

CHAPTER VI

CONDITIONS OF IMMEDIATE INFERENCE

Sec.1. Meaning of Inference 69
Sec.2. Immediate and Mediate Inference 70
Sec.3. The Laws of Thought 72
Sec.4. Identity 73
Sec.5. Contradiction and Excluded Middle 74
Sec.6. The Scope of Formal Inference 76

CHAPTER VII

IMMEDIATE INFERENCES

Sec.1. Plan of the Chapter 79
Sec.2. Subalternation 79
Sec.3. Connotative Subalternation 80
Sec.4. Conversion 82
Reciprocality (p. 84)
Sec.5. Obversion 85
Sec.6. Contrary Opposition 87
Sec.7. Contradictory Opposition 87
Sec.8. Sub-contrary Opposition 88
Sec.9. The Square of Opposition 89
Sec.10. Secondary modes of Immediate Inference 90
Sec.11. Immediate Inferences from Conditionals 93

CHAPTER VIII

ORDER OF TERMS, EULER'S DIAGRAMS, LOGICAL EQUATIONS,
EXISTENTIAL IMPORT OF PROPOSITIONS

Sec.1. Order of Terms in a proposition 95
Sec.2. Euler's Diagrams 97
Sec.3. Propositions considered as Equations 101
Sec.4. Existential Import of Propositions 104

CHAPTER IX

FORMAL CONDITIONS OF MEDIATE INFERENCE

Sec.1. Nature of Mediate Inference and Syllogism 107
Sec.2. General Canons of the Syllogism 108
Definitions of Categorical Syllogism; Middle Term;
Minor Term; Major Term; Minor and Major Premise (p. 109)
Illicit Process (p. 110);
Distribution of the Middle (p. 110);
Negative Premises (p. 112);
Particular Premises