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 alditols [HOCH2[CH(OH)]nCH2OH]
                   glycerol [C3H8O3; HOCH2CH(OH)CH2OH]