Corriston had no way of knowing that on Earth, shoulder to shoulder with other schoolboys, Freddy had never thought of himself as particularly small. It was only on Mars, all alone with his father and other grownups, that he had felt even smaller than he actually was. He had felt like a dwarf child.

"Why did you do it, Freddy?" Corriston asked. "Your father is very upset and worried."

Freddy looked up quickly and just as quickly lowered his eyes again.

"I had to come," he said. "I had to."

"But why?"

"I don't know."

"I see."

Corriston stared at him for a long moment in silence. Then he said: "I think perhaps I understand, Freddy. Just suppose we say you succumbed to an impulse to roam. The exploring urge can be overwhelming in a boy of your age. It usually is. If you were on Earth right now you'd be dreaming about exploring the headwaters of the Amazon. You'd be dreaming about birds with bright, tropical plumage and butterflies as big as dinner plates."

Freddy looked up again, not quite so quickly this time. There was wonder and admiration in his stare. "How did you know?" he gasped.

"I guess I was pretty much like you, Freddy—once," Corriston said.