He is as emphatic in his conclusion that some hybrids are perfectly fertile-as fertile as the pure parent-species-as are Kolreuter and Gartner that some degree of sterility between distinct species is a universal law of nature.
Hibrido batzuk erabat ugalkorrak-guraso-espezieak bezain ugalkorrak-diren ondorioa tinko baiezten du, Kölreuter eta Gärtnerrek espezie ezberdinen artean antzutasun mailaren bat dagoela dioten tinkotasun beraz baieztu ere.