"Exactly—he lives on heat!" Arcot said. "I've noticed that he seems almost cold-blooded; his body is at the temperature of the room at all times. In a sense, he is reptilian, but he's vastly more efficient and greatly different than any reptile Earth ever knew. He eats food, all right, but he only needs it to replace his body cells and to fuel his brain."
"Oh, brother," said Morey softly. "No wonder he can do the things he did! Why, he could have kept up that fight for hours without getting tired! Fatigue is as unknown to him as cold weather. He'd only need sleep to replace worn parts. His world is warm and upright on its axis, so there are no seasons. He couldn't survive in the Arctic, but he's obviously the ideal form of life for the tropics."
As the two men found out later, Morey was wrong on that last point. The men of Torlos' race had a small organ, a mass of cells in the lower abdomen which could absorb food from the bloodstream and oxidize it, yielding heat, whenever the temperature of the blood dropped below a certain point. Then they could live very comfortably in the Arctic zones; they carried their own heaters. Their vast strength was limited then, however, and they were forced to eat more and were more subject to fatigue.
Wade and Fuller had been trying to speak with Torlos telepathically, and had evidently run into difficulty, for Fuller called into the control room: "Hey, Arcot, come here a minute! I thought telepathy was a universal language, but this guy doesn't get our ideas at all! And we can't make out some of his. Just now, he seemed to be thinking of 'nourishment' or 'food', and I found out he was thinking of 'heat'!"
"I'll be right down," Arcot told him, heading for the library.
As he entered, Torlos smiled at him; Arcot picked up his thought easily: "Your friends do not seem to understand my thoughts."
"We are not made as you are," Arcot explained, "and our thought forms are different. To you, 'heat' and 'food' are practically the same thing, but we do not think of them as such."
He continued, explaining carefully to Torlos the differences between their bodies and their methods of using energy.
"Stone bones!" Torlos thought in amazement. "And chemical engines for muscles! No wonder you seem so weak. And yet, with your brains, I would hate to have to fight a war with your people!"
"Which brings me to another point," Arcot continued. "We would like to know how the war between the people of Sator and the people of Nansal began. Has it been going on very long?"