When the bacteriologist had left the meteor, there had been a high, bronze-colored tower, a burnished lighthouse, covering its entire top. It had been there--but now it was gone! Only the jagged, arched surface of the meteor remained. They lowered boats and rowed to the strange island. There they saw something that filled them--Parkinson especially--with a very definite uneasiness. The entire top of the meteor was a twisted, fire-blasted mass of bronze-like metal. Where the tower had been, where the shaft had led into the remarkable interplanetary vehicle, there was now a broken expanse of thoque that flashed fire under the rays of the sun. Something seemed to have melted, to have fused the tower, until it had crumpled, and had run, filling the entrance of the meteor. There was irrefutable evidence to that effect; no one thought otherwise. But what agency had done this strange thing? Someone suggested that it might have been the work of some prearranged mechanism. Parkinson shook his head. Had such been the case, his Venerian knowledge would have told him so. Obviously, nothing of Earth had done it, nothing of Earth--then something of Venus! Inconclusive conjecture, perhaps, but no other explanation offered itself. Something had sealed the contents of the meteor from the sight of man, something with a purpose. From Venus? The thought was logical, to say the least. Not for long did they remain there beside the Venerian vehicle; there was naught for them to do, so they turned about and headed toward the United States. They bore tidings that were vaguely disturbing, tidings that none were glad to hear. For, according to all indications, something alien to Earth was still within her confines. * * * * * Behind it all--the meteors, the Plague, the sealing of the Venerian vehicle--is one fact of great significance. No longer is man alone in the universe; no longer is he in isolation! Out of space came a menace, an intelligence striving to wrest from him his right to rule over Earth. No longer can man in his smug complacency think of himself as being secure in his strength. He has been shown the utter folly of such thinking. The menace--the invaders from Venus--came, and were destroyed, their purposes defeated. Yet--in the vast reaches of space, in worlds of other dimensions, in the cosmic crucible of life that embodies all creation, there may be other forms of life, other menaces, hovering clouds of death, preparing to sweep down upon Earth to snuff out her life. Who can tell? And who may say that man is free from the Venerian danger? The strange sealing of the meteor implies that the menace is still present. Who knows but what those inhuman Venerian brutes may even now be planning some new invasion, may be preparing to renew their attack upon Earth? Time alone will tell. ROBOT PILOTS FOR AIRCRAFT