20. Explain the nature of a hypothetical (or conditional) proposition. What do you consider the radical difference between it and a categorical? [S]
21. What is the function of the copula? In what different manners has it been treated? [S]
22. Convert "A killed C unjustly"; "All Knowledge is probably useful"; "The exception proves the rule"; "Birds of a feather flock together." [S]
23. What is modality? How are modals treated by (a) formal logic and (b) by the theory of induction? [S]
24. What is the subject of an impersonal proposition? Give reasons for your answer. [S]
25. Is the categorical proposition sufficiently described as referring a thing or things to a class? [S]
26. Enumerate the cases in which the truth or falsity of one proposition may be formally inferred from the truth or falsity of another. Illustrate these cases, and give to each its technical name. [S]
27. Illustrate the relation of Immediate Inferences to the Laws of Thought.
28. Explain what is meant by (a) Symbolic Logic; (b) the Logic of Relatives. Describe some method of representing propositions by means of diagrams; and indicate how far any particular theory of the import of propositions is involved in such representation. [S]