oups of sea-cows herded together; they were
manatees, that, like the dugong and the stellera, belong to the skenian
order. These beautiful 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 role 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 putrefied 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 cleaned of whales and seals. Then, infested with poulps,
medusae, and cuttle-fish, they would become immense centres of
infection, since their waves would not possess 'these vast stomachs
that God had charged to infest the surface of the seas.'"

CHAPTER XVIII

THE POULPS

For several days the Nautilus kept off from the American coast.
Evidently it did not wish to risk the tides of the Gulf of Mexico or of
the sea of the Antilles. April 16th, we sighted Martinique and
Guadaloupe from a distance of about thirty miles. I saw their tall
peaks for an instant. The Canadian, who counted on carrying out his
projects in the Gulf, by either landing or hailing one of the numerous
boats that coast from one island to another, was quite disheartened.
Flight would have been quite practicable, if Ned Land had been able to
take possession of the boat without the Captain's knowledge. But in
the open sea it could not be thought of. The Canadian, Conseil, and I
had a long conversation on this subject. For six months we had been
prisoners on board the Nautilus. We had travelled 17,000 leagues; and,
as Ned Land said, there was no reason why it should come to an end. We
could hope nothing from the Captain of the Nautilus, but only from
ourselves. Besides, for some time past he had become graver, more
retired, less sociable. He seemed to shun me. I met him rarely.
Formerly he was pleased to explain the submarine marvels to me; now he
le