There is still another sort called the narwhal, which may not be eaten for fear of disease, for men fall ill and die if they eat of it. This whale is not large in size; it never grows longer than twenty ells. It is not at all savage but rather tries to avoid fishermen. It has teeth in its head, all small but one which projects from the front of the upper jaw. This tooth is handsome, well formed, and straight as an onion stem. It may grow to a length of seven ells and is as even and smooth as if shaped with a tool. It projects straight forward from the head when the whale is traveling; but sharp and straight though it is, it is of no service as a defensive weapon; for the whale is so fond and careful of its tusk that it allows nothing to come near it. I know of no other varieties of whales that are unfit for human food, only these five that I have now enumerated: the two that I mentioned first were the beaked whale and the “hog whale;” the three mentioned later were the “horse whale,” the “red comb,” and the narwhal. There are certain varieties of even greater size which I have not yet described; and all those that I shall now discuss may be eaten by men. Some of them are dangerous for men to meet, while others are gentle and peaceable. One of these is called humpback; this fish is large and very dangerous to ships. It has a habit of striking at the vessel with its fins and of lying and floating just in front of the prow where sailors travel. Though the ship turn aside, the whale will continue to keep in front, so there is no choice but to sail upon it; but if a ship does sail upon it, the whale will throw the vessel and destroy all on board. The largest of these fishes grow to a length of seventy or eighty ells; they are good to eat. Then there is that kind which is called the Greenland whale.[209] This fish grows to a length of eighty or even ninety ells and is as large around as it is long; for a rope that is stretched the length of one will just reach around it where it is bulkiest. Its head is so large that it comprises fully a third of the entire bulk. This fish is very cleanly in choice of food; for people say that it subsists wholly on mist and rain and whatever falls into the sea from the air above. When one is caught and its entrails are examined, nothing is found in its abdomen like what is found in other fishes that take food, for the abdomen is empty and clean. It cannot readily open and close its mouth, for the whalebone which grows in it will rise[210] and stand upright in the mouth when it is opened wide; and consequently whales of this type often perish because of their inability to close the mouth. This whale rarely gives trouble to ships. It has no teeth and is fat and good to eat. Footnote 209: This is another name for the right whale described above; the author’s classification in this case must have been based on size only. Footnote 210: