Final answer:
The text excerpts provided do not contain information about Baron Danglars, Monsieur de Boville, or Eugenie and thus cannot be used to answer what Baron Danglars told Monsieur de Boville about Eugenie.
Step-by-step explanation:
The information provided in the excerpts does not specifically relate to Baron Danglars, Monsieur de Boville, or Eugenie. Therefore, I have no available content to directly answer the question regarding what Baron Danglars told Monsieur de Boville about Eugenie.
However, the excerpts contain details about another story involving characters like Winterbourne, Daisy Miller, Eugenio (a courier), Mrs. Costello, and others. It appears to be a reflection on social norms and expectations based on the interactions among the characters in a setting frequented by affluent American expatriates in Europe from the novel Daisy Miller by Henry James.
The story explores themes such as propriety, reputation, and the contrasts between American and European societal behaviors.
Unfortunately, this does not provide the requested information about Baron Danglars and Eugenie. If other information is required or there has been a misunderstanding of the excerpts, please provide additional context or clarify the question.