“Like the equator,” said Fuller.

“The equator is good,” said Ray; “so’s the tropic of Cancer.”

“How can you follow the equator when you can’t see it?” Pee-wee demanded.

“All the more fun,” said Fuller; “if you don’t see it, it doesn’t worry you.”

It was very amusing to see these two sitting side by side on the fender, dangling their legs, with apparently not the slightest curiosity about where they were going.

“That’s one thing I don’t like about the Earth,” said Ray; “it travels in an orbit; you know just where you’re going. Otherwise I like it.”

“Oh, the Earth isn’t so bad,” said Fuller. “You’re crazy!” Pee-wee shouted. “Railroads go to places; everything goes to places. You have to know where you’re going.”

“No you don’t, Scout,” said Fuller in a way of thoughtful consideration. “The way we go on a vacation is the best way. How about that, Ray?”

“Absolutely,” said Ray.

“Now at Hydome this is the way we do when vacation comes around,” said Fuller. “The first thing we do is to throw ourselves off the track. Let me explain to you. We decide that we want to go somewhere—”