“We thought it would get you,” he said. “Boys, you’re looking at one of the largest lakes in the entire world. Covers an area of nearly twenty seven thousand square miles, and is over two hundred and fifty miles long.”
“Biggest I’ve ever seen,” remarked Joe. “And right here in the heart of Africa.”
He had brought a motion-picture camera and now removed it to roll off a fair amount of film.
“What’s that away over there?” inquired Bob wonderingly, pointing to a dark cloud that hovered near the surface of the water.
The others gazed intently for several moments. Then, when the dark mass was slightly nearer, Mr. Lewis uttered an exclamation.
“If I’m not mistaken, that cloud isn’t a cloud,” he said, removing his binoculars from their case.
“Then—what is it?” demanded Joe.
A moment later his father confirmed his own opinion.
“Just as I thought,” Mr. Lewis said, peering out through his powerful glasses. “That isn’t a cloud at all. It is a big mass of insects.”