We have no more reason to believe in such a relation than we have to believe that the similar bones in the hand of a man, wing of a bat, and fin of a porpoise, are related to similar conditions of life.
Erlazio horretan sinesteko ez dugu, ukan ere, gizakiaren eskuko, saguzarraren hegoko eta mazoparen hegatseko hezur kideak antzeko bizi-baldintzekin erlazionaturik daudela sinesteko dugun baino arrazoi gehiagorik.