but as I have attempted to show in my work on the variation of domestic animals, it is not necessary to suppose that the modifications were all simultaneous, if they were extremely slight and gradual.
baina, etxe-animalien aldakuntzei buruzko neure idazlanean azaltzen saiatu naizen bezala, ez da beharrezko aldakuntza guztiak batera egin zirela suposatzea, oso txikiak eta astiro gertatuak izan baziren.