Preposition: of

• poetry: His declamation of most wondrous poetry was beautifully clear.

Adjective modifier

• passionate: Much now appears very dated: Carducci's oratory, the passionate declamation on Italy's place in the world, the Roman past.

• mere: One is that they deal too much in mere declamation, without any reference to a connected train of reasoning.

• empty: All their thoughts are spent in empty declamations and forms of satire or anger, and these do not subdue affections.