In tracing the homologies of any part in different members of the same class, nothing is more common, or, in order fully to understand the relations of the parts, more useful than the discovery of rudiments.
Klase bereko kide ezberdinetan edozein atalen homologotasunak taiutzerakoan, ez dago gauza ohikoago eta baliagarriagorik, atalon zerikusiak zeharo ulertzeko, aztarna-organoak aurkitzea baino.