"I wonder if those things are edible--or store water?" Brion's voice was a harsh rasp. Lea blinked and squinted at the leathery shape on the summit of the dune. Plant or animal, it was hard to tell. The size of a man's head, wrinkled and gray as dried-out leather, knobbed with thick spikes. Brion pushed it up with his toe and they had a brief glimpse of a white roundness, like a shiny taproot, going down into the dune. Then the thing contracted, pulling itself lower into the sand. At the same instant something thin and sharp lashed out through a fold in the skin, striking at Brion's boot and withdrawing. There was a scratch on the hard plastic, beaded with drops of green liquid. "Probably poison," he said, digging his toe into the sand. "This thing is too mean to fool with--without a good reason. Let's keep going." * * * * * It was before noon when Lea fell down. She really wanted to go on, but her body wouldn't obey. The thin soles of her shoes were no protection against the burning sand and her feet were lumps of raw pain. Heat hammered down, poured up from the sand and swirled her in an oven of pain. The air she gasped in was molten metal that dried and cracked her mouth. Each pulse of her heart throbbed blood to the wound in her scalp until it seemed her skull would burst with the agony. She had stripped down to the short tunic--in spite of Brion's insistence that she keep her body protected from the sun--and that clung to her, soaked with sweat. She tore at it in a desperate effort to breathe. There was no escape from the unending heat. Though the baked sand burned torture into her knees and hands she couldn't rise. It took all her strength not to fall farther. Her eyes closed and everything swirled in immense circles. Brion blinking through slitted eyes, saw her go down. He lifted and carried her again as he had the night before. The hot touch of her body shocked his bare arms. Her skin was flushed pink. Wiping his palm free of sweat and sand he touched her skin and felt the ominous hot dryness. Heat-shock, all the symptoms. Dry, flushed skin, the ragged breathing. Her temperature rising quickly as her body stopped fighting the heat and succumbed. There was nothing he could do here to protect her from the heat. He measured a tiny portion of the remaining water into her mouth and she swallowed convulsively. The thinnest of the clothing protected her slight body from the direct rays of the sun. After that he could only take her in his arms and keep on toward the horizon. An outcropping of rock there threw a tiny patch of shade and he walked toward it.