rational mind controls the structure and energy of organized matter."

"I've listened to Dr. Endhart teaching that to the small children," she replied. "It—it is difficult to believe." She began to laugh again; waves of hysteria swept her body. "I'm sorry, Lanny. I've thought, sometimes, that I'm losing my mind. We're never really certain of ourselves, are we? Two plus two doesn't have to make four, I suppose; it's just more convenient when it does."

"I could show you how to heal yourself, Tak Laleen."

"Ever since I came here I've been learning, Lanny. But it does no good unless I'm willing to learn first. My mind is tied down by everything I already know. I can put my two and two together as often as I like, and I still come up with four. Any other answer is insanity."

Twice, as they walked through the streets, Pendillo took a turn which led toward one of the enemy chapels. Lanny swiftly guided the missionary in another direction. The third time they came upon the Chapel of the Triangle suddenly, and before he could pull Tak Laleen back she broke free and fled toward the glowing Triangle, crying for help in her native tongue.

Lanny sprinted after her. Tak Laleen beat with her fists on the metal door. From the air above them came the high whine of a materializing force-field. Capsules swung down upon them. The missionary was swallowed within the church. Lanny and his father were enveloped in a single bubble.

It rose on an automatic beam and arched toward the skyport. In panic Lanny glanced down through the opalescent field at the settlement rolling by beneath them, and the choppy water of the bay, turned scarlet by the setting sun. Pendillo leaned calmly against the curved wall of their prison.

"She betrayed us!" Lanny cried.

"I expected her to, my son."

"You—you knew this would happen?"

"A teacher must sometimes contrive a unique—and possibly painful—learning situation. It's one of the risks of our profession."

"Why, father? She'll tell the Almost-men about the attack on the skyport; she'll tell them—"

Pendillo tapped the curved wall of force. "We're in a tight spot, Lanny. It's up to you to get us out—without a gun and without any of the enemy machines. All you have to work with are your brains and what we've taught you 

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