animals, peaceable and inoffensive, from eighteen to twenty-one feet in length, weigh at least sixteen hundredweight. I told Ned Land and Conseil that provident nature had assigned an important rôle to these mammalia. Indeed, they, like the seals, are designed to graze on the submarine prairies, and thus destroy the accumulation of weed that obstructs the tropical rivers.
"And do you know," I added, "what has been the result since men have almost entirely annihilated this useful race? That the putrified weeds have poisoned the air, and the poisoned air causes the yellow fever, that desolates these beautiful countries. Enormous vegetations are multiplied under the torrid seas, and the evil is irresistibly developed from the mouth of the Rio de la Plata to Florida. If we are to believe Toussenel, this plague is nothing to what it would be if the seas were cleared of whales and seals. Then, infested with poulps, medusæ, and cuttle-fish, they would become immense centers of infection, since their waves would not possess 'these vast stomachs that God had charged to infest the surface of the seas'"
However, without disputing these theories, the crew of the Nautilus took possession of half a dozen manatees. They provisioned the larders with excellent flesh, superior to beef and veal. This sport was not interesting. The manatees allowed themselves to be hit without defending themselves. Several thousand pounds of meat were stored up on board to be dried. On this day, a successful haul of fish increased the stores of the Nautilus, so full of game were these seas. They were echeneides; their flattened disks were composed of transverse movable cartilaginous plates, by which the animal was enabled to create a vacuum, and so to adhere to any object like a cupping-glass.
The echeneis effects their capture with extraordinary precision and certainty. This animal is, indeed, a living fish-hook, which would make the fortune of an inexperienced fisherman. The crew of the Nautilus tied a ring to the tail of these fish, so large as not to encumber their movements, and to this ring a long cord, lashed to the ship's side by the other end. The echeneids, thrown into the sea, directly began their game, and fixed themselves to the breast-plate of some turtles. Their tenacity was such that they would be torn apart rather than let go their hold. The
