 At first glance, there are some surprises in Buridan’s presentation of assertoric syllogistic. In the second figure he accepts indirect conclusions for IEO (Tifesno) and OAO (Robaco), and in the third figure indirect conclusions for AOO (Carbodo), AEO (Lapfeton), and IEO (Rifeson). He also accepts syllogisms concluding to what he calls an “uncommon idiom for negatives,” that is, when the predicate term precedes the negation, as in ‘Some B A is not’ (Quaedam B A est non). Such sentences make no sense in English, but Buridan treats them as equivalent to sentences where the predicate term quantified, as in ‘Some B is not some A’. He writes the sentences in this way because otherwise they would violate his rules for distribution and scope. Syllogisms concluding to an “uncommon idiom for negatives” add another three valid forms in the first figure and two in the second. If we tally this up and include all of the indirect conclusions, we get 33 valid moods, as opposed to 19 in Aristotelian syllogistic. If we then add the supplementary subalternate conclusions, we get 24 valid moods in traditional syllogistic but 38 in Buridan’s systematization.