Yet, confronting us now was a new type, from realms of interstellar space, far beyond our solar system.

"For the last time, will you talk?" snapped Brayley.

There was another interval of silence. The eyes of the brain were very watchful. Its gaze roved the hall as though it were seeking for help. It shifted its little arms on the table, seemingly exhausted from the physical effort of supporting itself.

Brayley's voice came again. "Doubtless you can feel pain acutely. We shall see."

With what effort of will to overcome his revulsion we may only guess, he reached forward and pinched the little arm. The result was electrifying. From the upended slit of mouth in that goggling face, came a scream. It pierced the heavy tense silence of the hall, ghastly in its timbre, like nothing any of us had ever heard before. And in it was conveyed agony as though Brayley had not merely pinched that flabby arm, but had thrust a red-hot knife into its vitals.

The brain could feel pain indeed. It crouched with stiffened arms and legs. The membrane of its great head seemed to bulge with greater distension; the knotted blood-vessels were gorged with purple blood. The eyes rolled. Then it closed its mouth. Its gaze steadied upon Brayley's face, so baleful a gaze that as I could see the reflection of its luminous purple glow a shudder of fear and revulsion swept me.

"So you did not like that?" Brayley steadied his voice. "If you don't want more, you had better speak. How did you get here on Earth? What are you trying to do here?"

There seemed an interminable silence; then Nippor took a menacing step forward. "Speak! We will force it from you!"

And then it spoke. "Do—not—touch—me—again."

Indescribable voice! Human, animal or monster no one could say. But the words were clear, precise; and for all their terror, they seemed to hold an infinite command.