The next diversion on board was created by the capture of a large shark that had been hovering in our wake for several days, and suspected of having purloined more than one joint of sailors’ pork, suspended from the bowsprit to wash out superfluous salt. At last he was caught in the act and duly reported; a deputation waited on the chief mate, and, averse as captains are as a rule to the mess that such a capture makes on the “holy-stoned” deck, the dire decree went forth for his punishment. This involved the sacrifice of yet another leg of pork, and in a few moments he was on deck, his spine being at once severed at its caudal extremity with a blow from an axe. The shark, though in reality but little out of harmony with the law of Nature, which is “one with rapine,” has acquired with all nations, civilized and barbarian, a reputation even worse than that enjoyed by its terrestrial prototype—the tiger. It would be superfluous on my part to describe the arrangement of his fins, or the size and number of his serrated, lancet-shaped teeth; for do they not nowadays teach Natural History even in Board schools! Still more remarkable than anything about the shark itself is the presence of the two pilot-fish that almost invariably flank its head on either side. These interesting creatures instantly swim towards anything that is thrown on the water, swim round it, and then return to their patron; if it be a bottle, or any other inedible object, all three then remain aloof, but if fit to eat, the shark immediately makes for it. When he is captured, indeed, they will swim for days on either side of the rudder, with the fidelity of dogs; and on one occasion I managed, after several hours’ hard work, to entrap them both in a bucket. Belonging, as they do, to the Scomberidæ, they bear in shape a pronounced resemblance to the mackerel; the average length is one foot, and the body, which is of a silvery gray, is marked with five transverse dark bands; while the dorsal fin, when erect, reminds one forcibly of the perch, but the family to which they belong, and which includes the albacore, bonito, and mackerel, has no representative in fresh water.