"A little of that, I think; but I believe Mr. Collier intends also to make an exhibit showing the way sponges grow. So you see he is as much interested as your father in reviewing the sponge question."

At this juncture Colin heard his name called.

"Yes, Mr. Collier," he answered.

"Do you think you have been over most of the reef?"

"Yes, sir, I think so," the boy answered; "Early Bird said yesterday that we had covered the sea-garden grounds fairly thoroughly. But,

of course, there are miles of reef that we haven't seen."

"I think, Mr. Murren," the scientist said, turning to his host, "that I can finish up all my business here by to-morrow night and be ready for a start the following morning. If that's agreeable to you, we shall be very glad to accept your invitation."

"That's agreed, then," said the capitalist, "and now we'll have some music."

The trip to Florida on the Golden Falcon was one of the pleasantest Colin had ever known. The little craft fairly flew through the water. He liked his host and hostess immensely, both of whom were accomplished musicians, and he struck up quite a friendship with Paul. The capitalist's son, though but a month or two younger than Colin, was quite inclined to give the latter a little hero-worship. And it was significant of Colin's make-up that he was equally ready to take it. Little of note occurred on the voyage save that the yacht almost ran over a sunfish in the water, which turned a sluggish somersault and disappeared. What was of more interest to Colin and indeed to Paul also was the opportunity to use a very powerful microscope belonging to the museum

curator and to find out about the almost invisible life of the ocean.