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 inositols [~[CHOR]6~] inositolᵀ [C6H12O6; ~[CHOH]6~] Stereoisomer myo-inositol [C6H12O6; ~[CHOH]6~]