Logic, Inductive and Deductive

by William Minto

Some P is in M,

but the conclusion Some P is in S has to be simply converted.

Placed after a vowel, p indicates that the proposition has to be converted per accidens. Thus in FElAptOn of the Third (MP, MS)

No M is in P

All M is in S

Some S is not in P

you have to substitute for All M is in S its converse by limitation to get the premisses of FErIO.

Two of the Minor Moods, Baroko of the Second Figure, and Bokardo of the Third, cannot be reduced to the First Figure by the ordinary processes of Conversion and Transposition. It is for dealing with these intractable moods that Contraposition is required. Thus in BArOkO of the Second (PM, SM)

All P is in M.