Hence, in determining whether a form should be ranked as a species or a variety, the opinion of naturalists having sound judgment and wide experience seems the only guide to follow.
Horregatik, forma bat espezietzat ala aldakitzat sailkatu behar den erabakitzean, badirudi erizmen oneko eta esperientzia zabaleko naturalisten eritzia dela jarraiki beharreko gidari bakarra.