In his book De Genesi ad litteram (On the Literal Meaning of Genesis), he stated that in some cases new creatures may have come about through the "decomposition" of earlier forms of life.
No seu libro De Genesi ad litteram (Sobre o significado literal do Xénese), indicou que nalgúns casos poden orixinarse novas criaturas pola "descomposición" de formas de vida iniciais.