And that is why Danny Duke had to wait so long to tell Sally of his grand discoveries.

That afternoon Sally and Barbara rode five miles to the training field with six boys who were to take the same training.

“Pipe the girls,” one fellow called when they were first sighted.

“Shut up!” another boy exclaimed low. “If they are going to take to the chutes, it’s not just for fun. It really takes guts. If they’ve got what it takes you have to hand it to them.”

“Ever run a children’s playground?” the director asked Sally.

“Yes, once, quite a while ago—”

“Well, this is just another one of them. Only difference is you swing on your chute straps just to get used to them instead of from the old apple tree. And if you don’t fasten your straps just right you get a good bump.”

“And you learn by bumps,” Sally laughed.

“Yes, and that way you don’t get killed later.”

“It’s the same way with the slide,” the instructor added. “It’s just a kid’s slide, only longer, and you fall harder—that is, if you don’t relax properly.”