There was no alarm. I could not chance leaping from his hip. I scurried along the convex top of his outstretched leg, and beyond his knee I jumped.

I landed safely. I could see the black vial back across the broken rock surface, with the bulge of Polter's hip above it. I ran back and reached the vial; tugged at its huge stopper. The cork began to yield under my panting, desperate efforts. In a moment I would have a pellet of the enlarging drug; make away with it; startle Polter so that Babs might dart off and escape.

The huge stopper of the vial was larger than my head. It came suddenly out. I flung it away, plunged in my hand, and seized an enormous round pellet.

Then abruptly the alarm came, and I had not caused it! Polter ripped out a startled, rumbling curse and sat upright. Under the curve of his leg, I saw that Babs had been momentarily neglected. She was running.

Across the boulder-strewn plain, two tiny men had appeared. Polter had seen them.

They were the enlarging figures of Dr. Kent and Alan!

CHAPTER XI

The Combat of Size

he astounded Polter was taken wholly by surprise. He could have had no idea that anyone was following him. He thought he was alone with the tiny Babs in this rock-strewn metal desert. What he saw as he scrambled to his feet were four insect-size humans, two of them at a distance, and two within reach of him, and all of them scampering in different directions. The ground was littered with crags and boulders; was ridged and pitted, pock-marked, with tiny crater-holes and caves. The four scuttling figures almost instantly had disappeared from his sight.