He ran ahead, Roane following and Nugget plumping heavily with him. They reached the raised place—actually a mere hillock no more than five or six feet above the surrounding sand, with a distorted cactuslike growth protruding from the ground. Huyghens stared again. He used his binoculars.

"One sphex," he said curtly. "Just one! And it's out of all reason for a sphex to be alone! But it's not rational for them to gather in hundreds of thousands, either!" He wetted his finger and held it up. "No wind at all."

He used the binoculars again.

"It doesn't know we're here," he added. "It's moving away. Not another one in sight—" He hesitated, biting his lips. "Look here, Roane! I'd like to kill that one lone sphex and find out something. There's a fifty per cent chance I could find out something really important. But—I might have to run. If I'm right—" Then he said grimly, "It'll have to be done quickly. I'm going to ride Faro Nell—for speed. I doubt Sitka or Sourdough would stay behind. But Nugget can't run fast enough. Will you stay here with him?"

Roane drew in his breath. Then he said calmly:

"You know what you're doing. Of course."

"Keep your eyes open. If you see anything, even at a distance, shoot and we'll be back—fast! Don't wait until something's close enough to hit. Shoot the instant you see anything—if you do!"

Roane nodded. He found it peculiarly difficult to speak again. Huyghens went over to the embattled bears. He climbed up on Faro Nell's back, holding fast by her shaggy fur.

"Let's go!" he snapped. "That way! Hup!"

The three Kodiaks plunged away at a dead run, Huyghens lurching and swaying on Faro Nell's back. The sudden rush dislodged Semper from his perch. He flapped wildly and got aloft. Then he followed effortfully, flying low.

It happened very quickly. A Kodiak bear can travel as fast as a race horse on occasion. These three plunged arrow-straight for a spot perhaps half a mile distant, where a blue-and-tawny shape whirled to face them. There was the crash of Huyghens' weapon from where he rode on Faro Nell's back—the explosion of the weapon and the bullet was one sound. The somehow unnatural spiky monster leaped and died.

Huyghens jumped down from Faro Nell. He became feverishly busy at something on the ground—where the parti-colored sphex had 

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