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.
Dalam bukunya De Genesi ad litteram (Tentang Pengartian Harfiah Kitab Kejadian), ia menyatakan bahwa dalam beberapa kasus, makhluk-makhluk baru dapat datang melalui "dekomposisi" dari bentuk kehidupan sebelumnya.