“Piranhas and alligators are very common all through this region,” he said.

Mr. Holton and Mr. Lewis got out a ration of food, while Bob and Joe attended to minor tasks. Professor Bigelow looked after the plates and utensils.

In a short time the meal was prepared, and all ate in quiet contentment. The food tasted good after those three long hours of constant traveling.

Bob and Joe glanced at the frowning jungle, which was but a short distance away. It seemed to challenge the explorers to penetrate its leafy depths, although in many places this was almost impossible.

“Quite a variety of trees,” observed Bob, his eye scanning the edge. “I suppose there are hundreds of different kinds.”

“There are,” answered Professor Bigelow. “All different kinds, from mahogany to bacaba palms. Much of the wood is worthlessly soft and useless, but mahogany and a few others are shipped to all parts of the world. There would be a much greater amount sent out, though, if it were all buoyant. The fact that many of the logs are not prevents them from being floated downstream.”

The explorers spent several minutes in the shade of a large tree, talking and chatting merrily. Then the professor suggested that they move on, and the others were more than glad to do so.

“You’re right,” Mr. Lewis told the professor. “We want to cover as much ground as possible today.”

The provisions were packed in the boat. They then boarded, to be paddled upstream by the Indians.