EXERCISES.
309. Shew how the modus ponens may be reduced to the modus tollens. [K.]
310. Test the following: “If all men were capable of perfection, some would have attained it; but none having done so, none are capable of it.” [V.]
311. Examine technically the following argument:—
If you needed food, I would give you money; but as you do not care to work, you cannot need food; therefore, I will give you no money. [J.]
312. Shew what conclusion can be inferred from the premisses: He always stays in when it rains, but he often goes out when it is cold. [J.]
313. Construct conditional and hypothetical syllogisms in Cesare, Bocardo, Dimaris and reduce them to the first figure. [K.]
314. Name the mood and figure of the following, and shew that either one may be reduced to the other form:
| (1) | If R is true, Q is true, |
| If P is true, Q is not true, | |
| therefore, | If P is true, R is not true ; |
| (2) | If Y is true, Z is not true, |
| If Y is true, X may be true, | |
| therefore, | If X is true, Z need not be true. |
[K.]