El autor habla de utilidad o de inutilidad según le viene y le parece a él.  Así lo que se encuentra muy desarrollado ha de ser útil: With respect to the assumed inutility of various parts and organs, it is hardly necessary to observe that even in the higher and best-known animals many structures exist, which are so highly developed that no one doubts that they are of importance, yet their use has not been, or has only recently been,…