Johann Caspar Goethe was interested in everything. It was no surprise, then, to find a book called Conversation des dents (A Conversation Among Teeth) by some Frenchman listed in the detailed catalogue Catharina Elisabeth, Johann Caspar's wife, commissioned when she sold their house and library in 1794.
Since 1937, efforts to restore the Goethe library are under way in Frankfurt. One of the books still missing is, yes, Conversation des dents. No trace or mention could be found of the mysterious tome during all these decades.
In time, a different books has taken its place. It seems a slight transcription error turned into "Conversation des dents" what should have been Conservation des dents — "Preserving Teeth", a book on dentistry.
If you don't want to risk any errors transcribing your library of contacts from one address book to another, you can read about exporting them there:
›› Need your contacts from Mac OS X Mail in CSV format? Here's how to export all your Mac OS X Address Book data to a CSV contacts file.