And they were astonished. In fact, when they pulled into the busy port, the boys’ eyes almost popped from their heads. Even after hearing about Manáos from their fathers, they could not believe that they would find anything like this away out in the heart of the vast wilderness.

“Has a rather impressive skyline,” observed Joe, gazing ahead at the outlines of the hotels and office buildings.

“Many of the structures are new,” put in Professor Bigelow. “The city’s growth has been rather rapid. But now,” he went on, “suppose we get off the boat and take a short trip about town.”

The adventurers easily procured a map of the city. Then they boarded a street car for a ride down the principal business street.

“Modern is right,” commented Bob, gazing out at the large buildings, hotels, theaters, and stores.

They passed many points of interest, including the Theatre of Manáos, the many parks and gardens, schools and colleges, and monuments and statues. And to cap all this, they spent several minutes in one of the most complete museums they had ever been in.

“Truly a great city in the heart of the forest,” said Mr. Holton, as they prepared to board the boat for the continuation of the journey.

They got to the Selvas with barely five minutes to spare. Already the crew were making ready for the long voyage that was to follow.

Shortly later they were again in the midst of the forest, after having left Manáos behind.

“I see we’re not the only passengers on the boat,” said Professor Bigelow, glancing across at two men who sat near the stern.