(4) Some philosophers have been slaves.
The same exercise may be performed upon any of the propositions in the preceding lists.
CHAPTER VI.
1. Give the converse by negation of—
(1) All women are lovely.
(2) Some statesmen are not practical.
(3) All lawyers are honest.
(4) All doctors are skilful.
(5) Some men are not rational.
2. Give the contrapositive of—