Editing Term logic (section)

=== The fourth figure ===
<blockquote>In Aristotelian syllogistic (''Prior Analytics'', Bk I Caps 4-7), syllogisms are divided into three figures according to the position of the middle term in the two premises. The fourth figure, in which the middle term is the predicate in the major premise and the subject in the minor, was added by Aristotle's pupil [[Theophrastus]] and does not occur in Aristotle's work, although there is evidence that Aristotle knew of fourth-figure syllogisms.<ref>{{cite book|last1=Russell|first1=Bertrand|title=Cambridge essays, 1888-99|last2=Blackwell|first2=Kenneth|publisher=Routledge|year=1983|isbn=978-0-04-920067-8|page=411}}</ref></blockquote>