Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "Lapideum Regnum" nom. inval. - mineral kingdom
           Class "Petrae" - stones
             Order "Calcarii" - calcareous stones
               Genus "Schistus"
                 1 "Schistus cinereus"
                 2 "Schistus nigricans friabilis"
                 3 "Schistus niger duriusculus"
                 4 "Schistus niger durus clangosus"