Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "Lapideum Regnum" nom. inval. - mineral kingdom
           Class "Fossilia" nom. inval. - Lapides aggregati
             Order "Concreta" - rocks
               Genus "Calculus"
                 1 "Calculus salivae dentium"
                 2 "Calculus gastrici animalium pecorum"
                 3 "Calculus Bilis cystidis"
                 4 "Calculus urinae humanae"
                 5 "Calculus urinae Simiarum, Caprorum &c."
                 6 "Calculus insecti Astaci"
                 7 "Calculus vermis conchae" - pearl