When the convicts and criminals, who were the ancestors of the Doomsmen, took possession of the old-time city, it is reasonable to suppose that among them were a certain proportion of technically educated men--artisans, mechanics, engineers. A power-plant of such imposing proportions (designed, we may conjecture, for the furnishing of motive power to one of the great transportation systems) could hardly escape their notice, and they would certainly know how to utilize it if they cared to do so. And they did--for a peculiar reason. It is a matter of record that in the twentieth century the universal form of capital punishment was execution by electricity. In every state-prison stood the "death-chair," the visible embodiment of the moral force which the wrong-doer had defied, and which, in the ensuing struggle, had proved too strong for him. No wonder that it was both feared and hated by the citizens of the underworld of crime. Now that the social fabric lay in ruins, now that the very foundations of law and order had been razed, what could be more natural than the impulse to turn this instrument of legal punishment into one of unlicensed vengeance? Society had dealt, mercilessly, with the breaker of laws, and now it was to suffer in its turn. So it came to pass that whenever a House-dweller (as representative of the old law-creating and law-abiding classes) fell alive into the hands of the Doomsmen, it was invariably ordained that he must take his seat in the chair of death and in his own body make satisfaction for the ancient debt. But the years rolled on, and with the new generations came a slow but sweeping change in sentiment. The Doomsmen were now the dominant race, and the Housemen had become their vassals. It was not good policy for a master to wantonly destroy productive property, and so by degrees these barbarous reprisals slackened. The time was now ripe for the second stage of the evolution--the introduction of the religious element and the final conversion of the execution into the sacrifice. That the transformation was a natural one may be easily shown. Even among the ancient scientists the nature of electricity was but imperfectly understood, and as the night of ignorance settled down upon the world it was inevitable that the various phenomena of electrical energy should come to be regarded with ever-increasing awe. To the commonalty among the Doomsmen this invisible, inaudible, intangible force which slew at a breath, became invested with supernatural attributes; it was the spirit of a god that came and sat in the chair of death, now transformed into the high altar of his chosen sacrifice.