(1) “No unpraiseworthy deed is virtue.” (2) “Some not-tactful persons are teachers.” (3) “Some untrustworthy men are those who lie.” (6b) Write the contraverse of the following: (1) “All honest men pay their debts.” (2) “All men are rational.” (3) “Nearly all the troops have left the town.” (4) “Some teachers are not patient.” (7a) The attending scheme indicates the logical process and rule involved in passing from one proposition to another: A. “All men are imperfect.” Process: Obversion. Rule: Negate predicate and change to E. E. “No men are perfect.” Process: Simple Conversion. Rule: Interchange subject and predicate. E. “No perfect beings are men.” Process: Contraversion. Rule: Obvert and then convert. I. “Some not-men are perfect beings.” (7b) Treat in a manner similar to the above the proposition, “All horses are quadrupeds.” =8. REVIEW QUESTIONS.= (1) What is inference? (2) What is the meaning of antecedent? (3) Define (1) judging, (2) a judgment. (4) All roses are beautiful, This flower is a rose, This flower is beautiful. Write this example of mediate inference in equation form. Name the middle term. (5) Define immediate inference. Illustrate. (6) Define mediate inference. Illustrate. (7) Name the five forms of immediate inference. (8) What principle is involved in inference by opposition? (9) Draw the scheme of opposition. (10) Make use of this scheme in deriving inferences from the following propositions: (a) “Good men are wise.” (b) “No king is infallible.” (c) “Cattle are ruminants.” (d) “All who cheat the railroads are not honest.” (11) What are contradictory propositions? Illustrate. (12) What would be the simplest way of disproving the statement that “No great religious teacher has been consistent?” (13) Why are A and E said to be contrary propositions? (14) Define obversion. (15) By what other name is obversion known? (16) State the basic principle of obversion. (17) Illustrate the process known as _negating the predicate_. (18) State the rule for obverting an A proposition. (19) Obvert the following: (1) “All the boys in my room are industrious.” (2) “Honesty is the best policy.” (3) “Only the industrious are truly successful.” (20) First state the rule and then obvert the following: (1) “Some plants are biennial.” (2) “Planets are not suns.” (3) “Blessed are the merciful.” (4) “These samples are not perfect.” (21) Define conversion. (22) State and illustrate the rules which condition the process of conversion.