Nor is this almost universal and perfect fertility surprising, when it is remembered how liable we are to argue in a circle with respect to varieties in a state of nature; and when we remember that the greater number of varieties have been produced under domestication by the selection of mere external differences, and that they have not been long exposed to uniform conditions of life.
Eta ugalkortasun ia unibertsal eta hobezin hau ere ez da harritzekoa, gogoratuz gero zein aiher garen natur egoerako aldakiei buruz gurpil zoroan eztabaidatzera; eta gogoratuz gero, aldakirik gehienak etxe-egoeran kanpoko ezberdintasun hutsen hautespenez sortuak direla eta ez direla luzaro izan bizi-baldintza uniformeen pean.