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 polysaccharides
                     1 Class glucans
                     2 Class mucopolysaccharides