As we may infer that our domestic animals were originally chosen by uncivilised man because they were useful, and because they bred readily under confinement, and not because they were subsequently found capable of far-extended transportation, the common and extraordinary capacity in our domestic animals of not only withstanding the most different climates, but of being perfectly fertile (a far severer test) under them, may be used as an argument that a large proportion of other animals now in a state of nature could easily be brought to bear widely different climates.
Gizaki ez-zibilizatuak gure etxe-animaliak baliagarri zitzaizkiolako eta hesipeko egoeran erraz umatzen zirelako, eta gero distantzia handietara garraia zitezkeela ikusi zuelako, haiek aukeratu zituela inferi genezakeenez gero, gure etxe-animalia guztiek klima ezberdinei eusteko ezezik, haietan erabat umekor izateko duten ahalmena (erizpide seguruagoa berau) argudiotzat erabil daiteke honako honen aldeko argudiotzat, alegia, gaur natur egoeran dauden beste animaliarik askok ere jasan ditzakeela klima oso ezberdinak.