Figure one uses:
Minor: C — B
Major: B — A
Conclusion: C — A
Figure four uses the reversed placement of the middle: B — C and A — B. Having the same three terms does not make two syllogisms the same figure; the positions of the middle term decide the figure.
For example, “Every physician is human” and “Every surgeon is a physician” directly establish that every surgeon is human. The fourth figure examines what may follow when the result is expressed in the reverse subject–predicate direction.
Opening interactive controls...
The Fourth Figure: Productive Conditions, Moods and Proofs
Figure one uses:
Minor: C — B
Major: B — A
Conclusion: C — A
Figure four uses the reversed placement of the middle: B — C and A — B. Having the same three terms does not make two syllogisms the same figure; the positions of the middle term decide the figure.
For example, “Every physician is human” and “Every surgeon is a physician” directly establish that every surgeon is human. The fourth figure examines what may follow when the result is expressed in the reverse subject–predicate direction.