"The School-Girls in Number 40 or Principle Put to the Test" is a book written by an anonymous author. Unfortunately, there is limited information available about this specific book or its author.From the title, it appears to be a story centered around schoolgirls living in a place identified as Number 40. The subtitle, "Principle Put to the Test," suggests that the narrative may involve a moral or ethical dilemma that the schoolgirls must face and resolve.Without more context or details about the plot, characters, or themes of "The School-Girls in Number 40," it's challenging to provide a summary or analysis. If you have any additional information about the book or specific aspects you'd like to know more about, please feel free to share, and I'll do my best to assist you further.