stream, at a fair rate of speed.

"What is it? Oh, what is it?" implored Alice.

"Can you see anything?" Ruth wanted to know.

"Some sort of animal has got hold of our anchor, or the rope," declared
Paul, "and it's towing us. I don't think it can be an alligator, though."

"Oh, what will become of us?" gasped Ruth.

"Don't be in the least alarmed!" exclaimed Paul. "All I'll have to do
will be to cut the rope, and we'll be free. But I don't want to lose the
anchor."

"Don't cut loose! Don't!" cried Russ, whose boat was now up to that
containing the two girls and the young actor. "I want to get a film of
that. You're not in any real danger; are you?"

"Oh, yes indeed we are!" said Ruth.

"Nonsense! We aren't at all!" protested her sister. "Only I'd like to see
what sort of a fish is towing us."

"It isn't a fish at all!" Paul suddenly exclaimed. "It's a manatee--a sea
cow!"

"Oh, a sea cow! I want to look at it!" Alice cried.

"You must keep quiet in the boat!" insisted Ruth, who seemed greatly