3), that whatever is true in one form of words is true in any other, there is no difficulty in applying it to Conversion.
Thus, to take the simple conversion of I., _Some S is P; .'.

Some P is S._ _Some poets are business-like; .'.

Some business-like men are poets._ Here the convertend and the converse say the same thing, and this is true if that is.
We have, then, two cases of simple conversion: of I.( as above) and of E.For E.: _No S is P; .'.

No P is S._ _No ruminants are carnivores; .'.

No carnivores are ruminants._ In converting I., the predicate (P) when taken as the new subject, being preindesignate, is treated as particular; and in converting E., the predicate (P), when taken as the new subject, is treated as universal, according to the rule in chap.v.Sec.