218. Obtain a conclusion from the two negative premisses,—No P is M, No S is M. [K.]
219. If it is false that the attribute B is ever found coexisting with A, and not less false that the attribute C is sometimes found absent from A, can you assert anything about B in terms of C? [C.]
220. Give examples (in symbols—taking S, M, P, as minor, middle, and major terms, respectively) in which, attempting to infer a universal conclusion where we have a particular premiss, we commit respectively one but one only of the following fallacies,—(a) undistributed middle, (b) illicit major, (c) illicit minor. Give also an example in which, making the same attempt, we commit none of the above fallacies. [K.]
221. Can an apparent syllogism break directly all the rules of the syllogism at once? [K.]
222. Can you give an instance of an invalid syllogism in which the major premiss is universal negative, the minor premiss affirmative, and the conclusion particular negative? If not, why not? [K.]
223. Shew that
(i) If both premisses of a syllogism are affirmative, and one but only one of them universal, they will between them distribute only one term;
(ii) If both premisses are affirmative and both universal, they will between them distribute two terms;
(iii) If one but only one premiss is negative, and one but only one premiss universal, they will between them distribute two terms;
(iv) If one but only one premiss is negative, and both premisses are universal, they will between them distribute three terms. [K.]
224. Ascertain how many distributed terms there may be in the premisses of a syllogism more than in the conclusion. [L.]
225. If the minor premiss of a syllogism is negative, what do you know about the position of the terms in the major? [O’S.]
307 226. If the major term of a syllogism is the predicate of the major premiss, what do you know about the minor premiss? [L.]
227. How much can you tell about a valid syllogism if you know (1) that only the middle term is distributed;
(2) that only the middle and minor terms are distributed;
(3) that all three terms are distributed? [W.]