The lustful old dame Lisabetta aids the protagonist, who does not heed the warnings of the kindly professor Pietro Baglioni.  
The narrative of this short story is presented as having been published in La Revue Anti-Aristocratique by a certain Monsieur de l'Aub?ine, an alter ego of the true author.  The lustful old dame Lisabetta aids the protagonist, who does not heed the warnings of the kindly professor Pietro Baglioni.  Though his suspicions are roused by purple marks on his skin, wilting flowers, and the title character's ability to kill insects by breathing on them, Giovanni pursues a relationship with Beatrice until discovering he has become poisonous as well due to the experiments of Beatrice's father.  FTP, what is this short story by Nathaniel Hawthorne?
The narrative of this short story is presented as having been published in La Revue Anti-Aristocratique by a certain Monsieur de l'Aub?ine, an alter ego of the true author.  
Rappaccini's Daughter