When a man's fingers have been amputated, imperfect nails have been known to appear on the stumps, and I could as soon believe that these vestiges of nails are developed in order to excrete horny matter, as that the rudimentary nails on the fin of the manatee have been developed for this same purpose.
Badakigu gizakiren bati behatzak moztu ondoren atzazal ezosoak agertu zaizkiola behatzondoetan, eta arrazoi bera izan nezake atzazal-aztarnok adarkizko substantzia iraizteko direla sinesteko, zein manati baten hegatsetako aztarna-atzazalak xede bererako garatu izan direla sinesteko ere.