If the names of the groups had been simply written down in a linear series the representation would have been still less natural; and it is notoriously not possible to represent in a series, on a flat surface, the affinities which we discover in nature among the beings of the same group.
Taldeen izenak lerro-seriean zehar idatzi izan balira besterik gabe, irudikapenak naturaltasun gutxiago zukeen oraindik; eta inola ere ez dago, bistan denez, serie batean edo azalera lau baten gainean irudikatzerik naturan talde bereko izakien artean aurkitzen ditugun ahaidetasunak.