What a Sperm Whale's Lower Jaw Is

Let us now, with whatever levers and steam engines we have at hand, cant over the sperm whale's head that it may lie bottom up. Then, ascending by a ladder to the summit, have a peep down the mouth. That of the latter is entirely and evenly covered over with a membrane so as to be quite imperceptible from without. But if his eyes were broad as the lens of herschel's great telescope, would that make him any longer of sight or sharper of hearing? Not at all. Why then do you to enlarge your mind suptilize it?