By W. H. S. Monck

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Is called Of these four propositions an Universal Affirmative, is used the latter form we should probably be understood not as several animals, but of a single animal. of speaking we Forms of Propositions. usually denoted by the letter A called a Particular Affirmative, letter tive, E the second, which is the by the letter I : : an Universal Negative, by the the fourth, which is called a Particular Nega which third, 7 : by the is called letter 0. Thus the following argument No B is : C. Some C is D.

In general it is a good rule to require a reasoner to state every step in his argument ; and if he does not state it himself you can make use of the rules of Logic to state it for him. In such cases you will very often find that the weak point of his argument does not lie in what he has said, but in what he has avoided saying, though case. it is equally essential to his An 34 Introduction to CHAPTEE THE SYLLOGISM AND HAVING Logic. Y. ITS RULES. stated the inferences which may "be drawn from a single categorical proposition, we now come to those I must here again which can be drawn from two.

2) non-C. is non-C. drawing inferences by Obversion a non to the predicate and alter rule for in affirmative affix the copula No B in negatives transfer the not or non from the copula to the predicate. to A, and to E, I to 0, E By this means A is to I. We reduced often find the to hand without any coining. negative words ready Thus The Soul is not mortal (which logicians treat as * Subalternation may thus be explained as inferring a particular pro an universal without transposing the terms. It is legitimate, position from the quality is unaltered.

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