Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class carbohydrates [Cn(H2O)n, etc.]
                 Class saccharides
                   Class monosaccharides - sugars
                     Class uronic acids
                       D-glucuronic acid