maintained his assault until, unable longer to withstand the frightful battering, the Overlord's barriers went completely down; until every convolution of his brain and every track of his mind lay open, helplessly exposed to Worsel's poignant scrutiny. Then, scarcely taking time to gloat over his victim, Worsel did scrutinize.

Period.

Hurtling through space, toward a definite objective now, Worsel studied and analyzed some of the things which he had just learned. Worsel was not surprised that this Overlord had not known any of his superior officers in things or enterprises Boskonian; that he did not consciously know even that he had been obeying orders or that he had superiors. That technique, by this time, was familiar enough. The Boskonian psychologists were able operators; to attempt to unravel the unknowable complexities of their subconscious compulsions would be a sheer waste of time.

What the Overlords had been doing, however, was clear enough. That outpost had indeed been wreaking havoc with Civilization's commerce. Ship after ship had been lured from its course; had been compelled to land upon this barren planet. Some of those vessels had been destroyed; some of them had been stripped and rifled as though by pirates of old; some of them had been set upon new courses with hulls, mechanical equipment, and cargoes untouched. No crewman or passenger, however, escaped unscathed; even though only ten percent of them died in the Overlordish fashion which Worsel knew so well.

The Overlord himself had wondered why they had not been able to kill them all. He knew that such forbearance was unnatural, was against all instinct and training. He knew that they wanted, intensely enough, to kill every one of their victims; that their greedy lust for life-force simply could not be sated as long as life-force was to be had. He knew only that something, none of them knew what, limited their actual killing to ten percent of the bag.

Worsel grinned wolfishly at that thought, even while he was admiring the quality of the psychology which could impress such a compulsion as that upon such rapacious hellions as those. That was the work of the Boskonian higher-ups, who knew that ten percent was the limit above which the deaths would have been too revealing to the statisticians of the Galactic Patrol.

The other ninety percent, however, the Delgonians had "played with"—a procedure which, although less satisfying to the Overlords than the ultimate treatment, was not very different in so 

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