I'm working on whittling down my email in-box, which included an email reminder to myself to copy this item over from Goodreads. (I often email myself "to do" items. It may not be a great system, but it's a system.) The question concerns the title of the book by Fortunatus that forms one of the first intellectual connections between Margerit and Barbara in Daughter of Mystery. I've left the question in the informal Q&A format in which it appeared on my Goodreads page.