Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies "crystal-kingdom" chemical substances chemical compounds Class "lipids" Class glycolipids Class glycosphingolipids Class cerebrosides [H3C(CH2)12CH=CHCH(OH)CH(NHC(=O)R)CH2O[glucose or galactose]] Class galactocerebrosides [H3C(CH2)12CH=CHCH(OH)CH(NHC(=O)R)CH2O[galactose]]