But the case of the short-faced tumbler, which when twelve hours old possessed its proper characters, proves that this is not the universal rule; for here the characteristic differences must either have appeared at an earlier period than usual, or, if not so, the differences must have been inherited, not at a corresponding, but at an earlier age.
Hala ere, uso itzulipurdikari aurpegimotzaren kasuak, bere ezaugarri bereziak jaio eta hamabi ordutara baitauzka, argi erakusten du ez gaudela arau unibertsal baten aurrean; izan ere, kasu horretan ezaugarri bereziok, edo ohikoa baino bizitzako aldi goiztiarragoan agertuak edo, horrela izan ezean, dagokien adinean barik adin goiztiarragoan heredatuak izan beharko dute.