"I mean that the artificial blood pumped by mechanical hearts through the brains of the Heads--yes, and that is now being pumped through my own!" cried Spiro bitterly--"is manufactured from human blood. Human blood is the basis of it. And to get that blood every Apexan must yield his quota in the temple. Slowly but surely this practice is sapping the vitality of the race. But though the Apexans realized this they were afraid to speak against the custom. For the Heads were worshipped as gods; and when the gods spoke, blasphemers died--horribly." * * * * * Miles and Ward shuddered. "Even I," went on Spiro, "denounced blasphemers and thought it holy that each should yield a little of his blood to the Almighty Ones. Then I woke from darkness to find myself--a Head. At first I could not understand, for I was in love with Ah-eeda--and can a machine mate? But it is true that love is largely desire, and desire of the body. With the death of the body, desire died; and it may be that pride and ambition took its place. But, for all that, there were moments when I remembered my lost manhood and dreamed of Ah-eeda. Yes, though the laboratory of the Heads revealed wonders of which I had never dreamed, though I looked into your world and studied its languages and history, though I was worshipped as a god and endless life stretched ahead of me--nevertheless, I could see that the strength of my race was being sapped, its virility lost!" His voice broke. "In the face of such knowledge what were immortality and power? Could they compensate for one hour of life and love as humanity lived it? So I brooded. Then one day in the temple I looked into the face of a girl about to be bled and recognized Ah-eeda. In that moment, hatred of the fiends posing as gods and draining the vitality of deluded worshippers, crystallized and drove me to action. So it was I who denounced the Heads, aroused the people!" Spiro's voice broke; died. Miles and Ward stared at him, horrified; and after a while Miles exclaimed, "We never suspected! We would never have fought to maintain such a thing had we known!" "Nonetheless," said Spiro inflexibly, "you fought for it, and many people died and more are afraid. Superstition is a hard thing to kill. Already there are those who murmur that truly the Heads are gods and have called up demons from the underworld, as they threatened they would, to smite them with thunder until once more they yield blood in the temple. But I know that without blood the Heads must die miserably and the people be freed from their vampire existence. It is true that I too shall die, but that is nothing. I die gladly. Therefore, to keep the people from sacrificing blood, to show them that you are mortal and the Heads powerless to save the demons they have raised, you must be slain in front of the great palace. "Yes; you, too, must die for the people!" * * * * *