Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class imines [RN=CR2]
                 1 Class aldimines [RN=CHR]
                 2 Class ketimines [RN=CR'2 (R'≠H)]
                 3.1 Class Schiff bases [RN=CR'2 (R≠H)]
                 3.2 Class azomethines [RN=CR2 (R≠H)]
                 4 Class quinonimines