In order to get some idea of what this whalebone is like as it hangs in the whale's mouth, we must try to picture what the whale itself is like. The largest of them grow to something like sixty feet in length. The head is unusually large, and forms about one-third of the whole body, and the inside of the mouth is about as large as a ship's cabin or a very small room. The strips of whalebone, which reach from the upper jaw to the lower one, must, therefore, be very large. The largest strips, which hang in the middle of the jaws, are rather like large planks, being from ten to fifteen feet long, and about twelve inches across at their widest part. They are thinner than planks, however, and perhaps we might better compare them to long and broad saw-blades. There are altogether about three hundred of these whalebone planks or blades in the whale's mouth. They are set transversely--that is to say, one narrow edge of each piece touches the tongue, while the other edge lies against the cheek or lip. They lie so close together that from the middle of the edge of one blade to the middle of the edge of the next the distance is less than an inch, and yet there is a space between them. The whole set extends like a huge grate round the whale's mouth, the bars of whalebone being long in the middle of the sides of the jaws, and growing shorter near the back and front.
Whalebone is very fibrous or stringy, and it splits very readily. The lower ends of the pieces in the whale's mouth are split and frayed into stiff bristles, and the inner edges are frayed in the same way, while the outer edges are made smooth, so that they do not hurt the inside of the animal's lips. The roof of the whale's mouth is covered with smaller pieces of whalebone hanging down like bristled quills. Many of these are only a few inches long, but they make the whole of the upper part of the whale's mouth rough and bristly.
The creature's tongue is an enormous one, often measuring six yards long and three yards wide. Its throat, however, is so small that sailors often say a herring would choke it. What can be the use of such a large mouth and tongue, and such large bars of whalebone to a creature which has so small a throat?