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‘Now these counter-syllogisms may plainly be constructed out of the same topics: for syllogisms’ (i. e. not all syllogisms, not the scientific and demonstrative, but dialectical syllogisms, and rhetorical enthymemes: note on I 1. 11) ‘are derived from probable materials, and mere (variable) opinions’ (what is generally thought, probabilities;— truth, the conclusions of science, is constant: and scientific demonstration, the object of which is ἀλήθεια, does not admit, like Dialectics and Rhetoric, of opposite conclusions, of arguments on either side of a question), ‘are often contrary to one another, (and therefore can be converted into opposite enthymemes)’.

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