These privileges are numerous, varied, sometimes ephemeral, and for the most part very variable according to the period, which in 1884 led to an author of "L'Intermédiaire des chercheurs et curieux ("The Intermediate of the Researchers and Curious): "The list of privileges of the bourgeois of Paris sometimes looks like an inventory à la Prévert (with no connection to each other), and changes over the decades. "