Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Lapideum - mineral kingdom
         Class Petræ - stones
           Order Vitrescentes - glassy stones
             Genus Cos
               1 Cos particulis inæqualibus rigidis
               1.0 Arenarius Lapis - sandstone see Cos particulis inaequalibus rigidis
               2 Cos particulis æqualibus friabilibus
               2.0 Coticula see Cos particulis aequalibus friabilibus
               3 Cos aquam filtrans
               3.0 Filtrum see Cos aquam filtrans