I make all these statements in regard to the relations existing between the shark and the pilot-fish, and between the mother shark and her young, upon the authority of Mr. Bullen, author of two interesting works, _The Cruise of the Cachalot_ and _Idylls of the Sea_. In regard to the reception by the shark into her stomach—or, at least, down her throat—of both her young and the pilot-fish, this certainly does seem surprising, but as Mr. Bullen was, on various occasions, present when a shark was cut open and her family and retainers found inside her, the fact seems established. He writes, too—so I gather—as an eye-witness of the habit _au naturel_. I do not know, therefore, why there should be no reference to it in works that are supposed to instruct, except that, as a rule, the scientific naturalist has but two lines of conduct in regard to the more picturesque doings of any animal. First, he denies what is not in accordance with his ideas and non-experience, and then he refuses to say anything about such things—cuts them, as it were, even after they have been properly introduced to him, and their respectability vouched for. If he had a third line he might, in time, frankly describe them, but generally he has only those two. CHAPTER XXII THE SHARK’S ATTACHÉ—QUEER WAYS OF FISHING—HINTS FOR NAVAL WARFARE—FISH THAT _DO_ FLY. The little pilot-fish is not the only friend that the shark has. The remora, or sucking-fish, as we shall soon see, is still more attached to him. This is one of the queerest fish in the whole ocean. Others may have a more extraordinary, or, at any rate, a more terrifying appearance, but not one of them is constructed on such an original principle, or has such a very quaint and ingenious process of getting through the world. What the process is may be guessed from the name of sucking-fish, but the remora does not suck with its mouth, but with its head. The whole upper surface of this consists of “a large, flat, plate-like adhesive disc,” and whatever this disc touches it adheres to with the greatest tenacity. The reason is that the air between the plate and anything it lies against is forced out, so that a vacuum is created, and when once this is the case, two things that touch each other always stick together. It is by virtue of this principle that a fly is able to walk along the ceiling, for all its six feet end in so many little adhesive discs or suckers, which act as strongly, in proportion to their size, as does that of the remora. But the remora, when it uses its sucker, does not walk, or even swim, which is the equivalent of walking in a fish; all that is done for it by the shark or turtle, to which it attaches itself. It just swims underneath it, and presses itself against its under side, and there it is carried along as safely as if it were riding in its own carriage—indeed, much more so, for there is less likely to be an accident, and if ever