Traditional Logic Memoria Press Practice Exam

The key idea here is how the middle term appears in the two premises. The middle term is M. In the major premise, M is the subject (All M are P). In the minor premise, M is the predicate (All S are M). When the middle term is the subject of the major premise and the predicate of the minor premise, this places the syllogism in the first figure. This arrangement corresponds to the classic Barbara form: All M are P; All S are M; Therefore All S are P, which is valid. So the figure is Figure I.