[Footnote 45: Marbach (Gesch. der Philos. s. 91), though he treats the Megarics as jesters (which I do not think they were), yet adds very justly: "Nevertheless these puzzles (propounded by the Megarics) have their serious and scientific side. We are forced to inquire, how it happens that the contradictions shown up in them are not merely possible but even necessary." Both Tiedemann and Winckelmann also remark that the debaters called Eristics contributed greatly to the formation of the theory and precepts of Logic, afterwards laid out by Aristotle. Winckelmann, Prolegg. ad Platon. Euthydem. pp. xxiv.-xxxi. Even Stallbaum, though full of harshness towards those Sophists whom he describes as belonging to the school of Protagoras, treats the Megaric philosophers with much greater respect. Prolegom. ad Platon. Euthydem. p. 9.] [Footnote 46: System of Logic, Book v. 1, 1.] [Footnote 47: Prantl (Gesch. der Logik, vol. i. pp. 43-50) ascribes to the Megarics all or nearly all the sophisms which Aristotle notices in the Treatise De Sophisticis Elenchis. This is more than can be proved, and more than I think probable. Several of them are taken from the Platonic Euthydêmus.] [Footnote 48: See the remarkable passages in the discourses of Sokrates (Memorab. iii. 1, 6; iv. 2, 15), and in that of Kambyses to Cyrus, which repeats the same opinion--Cyropæd. i. 6, 27--respecting the amount of deceit, treachery, the thievish and rapacious qualities required for conducting war against an enemy--([Greek: ta\ pro\s tou\s polemi/ous no/mima], i. 6, 34). Aristotle treats of Dialectic, as he does of Rhetoric, as an art having its theory, and precepts founded upon that theory. I shall have occasion to observe in a future chapter (xxi.), that logical Fallacies are not generated or invented by persons called Sophists, but are inherent liabilities to error in the human intellect; and that the habit of debate affords the only means of bringing them into clear daylight, and guarding against being deceived by them. Aristotle gives precepts both how to thrust, and how to parry with the best effect: if he had taught only how to parry, he would have left out one-half of the art. One of the most learned and candid of the Aristotelian commentators--M. Barthélemy St. Hilaire--observes as follows (Logique d'Aristote, p. 435, Paris, 1838) respecting De Sophist. Elenchis:-- "Aristote va donc s'occuper de la marche qu'il faut donner aux discussions sophistiques: et ici il serait difficile quelquefois de décider, à la manière dont les choses sont présentées par lui, si ce sont des conseils qu'il donne aux Sophistes, ou à ceux qui veulent éviter leurs ruses. Tout ce qui précède, prouve, au reste, que c'est en ce dernier sens qu'il faut entendre la pensée du philosophe. Ceci est d'ailleurs la seconde portion du traîté."