"They thought there might be," observed Calhoun. "That's why they ran away. They hoped they'd be safe where they ran to. I hope they are." Allison ignored the comment. His eyes remained intent and shrewd. He was not bewildered by the flight of the people of Maya. His mind was busy with contemplation of that flight from the standpoint of a man of business. * * * * * The car went racing onward. The endless fields of dark green rushed past to the rear. The highway was deserted, just three strips of surfaced road, mathematically straight, going on to the horizon. They went on by tens and scores of miles, each strip wide enough to allow four ground-cars to run side by side. The highway was intended to allow all the produce of all these fields to be taken to market or a processing plant at the highest possible speed and in any imaginable quantity. The same roads had allowed the cities to be deserted instantly the warning--whatever the warning was--arrived. Fifty miles beyond Tenochitlan there was a mile-long strip of sheds containing agricultural machinery for crop culture and trucks to carry the crops to market. There was no sign of life about the machinery, nor in a further hour's run to westward. Then there was a city visible to the left. But it was not served by this particular highway, but another. There was no sign of any movement in its streets. It moved along the horizon to the left and rear. Presently it disappeared. Half an hour later still, Murgatroyd said: "_Chee!_" He stirred uneasily. A moment later he said "_Chee!_" again. Calhoun turned his eyes from the road. Murgatroyd looked unhappy. Calhoun ran his hand over the _tormal's_ furry body. Murgatroyd pressed against him. The car raced on. Murgatroyd whimpered a little. Calhoun's hand felt the little animal's muscles tense sharply, and then relax, and after a little tense again. Murgatroyd said almost hysterically: "_Chee-chee-chee-chee!_" Calhoun stopped the car, but Murgatroyd did not seem to be relieved. Allison said impatiently, "What's the matter?" "That's what I'm trying to find out," said Calhoun.