Note 378 — Chapter V
Reading edition
The reader may possibly hesitate to admit the validity of this reasoning, although he feels no difficulty in regard to the validity of an ordinary categorical syllogism in Disamis. This apparent anomaly is connected with the problem of existential import. It will be shewn in section 342 that the validity of Disamis depends on our interpretation of propositions as regards their existential import, and we may perhaps not regard categoricals and hypotheticals as analogous in this respect.