The second figure is identified by the middle term serving as predicate in both premises. Its two productive conditions are:
1. The premises differ in quality.
2. The major premise is universal.
The first two moods yield universal negatives; the next two particular negatives. Conversion can reduce certain moods to the first figure, while reductio shows that denying their conclusions conflicts with the premises.
The next section treats the third figure, in which the middle is subject of both premises and different rules govern the quantity of the conclusion.