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120 luncheons as 8d. and 19d., on each assumption. He then concludes that this agreement of results "shows that the answers are correct." Now I propose to disprove his general law by simply giving one instance of its failing. One instance is quite enough. In logical language, in order to disprove a "universal affirmative," it is enough to prove its contradictory, which is a "particular negative." (I must pause for a digression on Logic, and especially on Ladies' Logic. The universal affirmative "everybody says he's a duck" is crushed instantly by proving the particular negative "Peter says he's a goose," which is equivalent to "Peter does not say he's a duck." And the universal negative "nobody calls on her" is well met by the particular affirmative "'I called yesterday." In short, either of two contradictories disproves the other: and the moral is that, since a particular proposition is much more easily proved than a universal one, it is the wisest course, in arguing with a Lady, to limit one's own assertions to "particulars," and leave her to prove the "universal" contradictory, if she can. You will thus generally secure a logical victory: a practical victory is not to be hoped for, since she can always fall back upon the crushing remark "that has nothing to do with it!"—a move for which Man has not yet discovered any satisfactory answer. Now let us return to .) Here is my "particular negative," on which to test his rule. Suppose the two