When Octavie and the author meet again they visit Pompéi , where they play the roles of Isis and Osiris , introducing the theme of the next essay .
When Octavie and the author meet again they visit Pompéi and the temple of Isis . 
 Octavie expresses the wish to play the rôle of Isis , and Nerval that of Osiris , introducing the theme of the next essay .