Department of Science secretly considered the whole idea ridiculous.

The staff of experts introduced themselves. Then, ignoring the protests of Lindy, went to work on Black Eyes. At first Judd thought the animal would object, but apparently it did not. While conditions all about them in the city worsened, the experts spent three days studying Black Eyes.

They found nothing out of the ordinary.

Black Eyes merely stared back at them, and but for an accident, they would have departed without a lead. On the third day, a huge mongrel dog which belonged to the Whitneys' next-door neighbors somehow slipped its leash. It was a fierce and ugly animal, and it was known to attack anything smaller than itself. It jumped the fence and landed in Judd Whitney's yard. A few loping bounds took it through an open window, ground level. Inside, it spied Black Eyes and made for the creature at once, howling furiously.

Black Eyes didn't budge.

And the mongrel changed its mind! The slavering tongue withdrew inside the chops, the howling stopped. The mongrel lay down on the floor and whined. Presently it lost all interest, got to its feet, and left as it had come.

Other animals were brought to the Whitney home. Cats. Dogs. A lion from the city zoo, starved for two days and brought in a special mobile cage by its keeper. Black Eyes was thrust into the cage and the lion gave forth with a hideous yowling. Soon it stopped, rolled over, and slept.

The scientists correlated their reports, returned with them to the Whitney house. The leader, whose name was Jamison, said: "As closely as we can tell, Black Eyes is the culprit."

"What?" Lindy demanded.

"Yes, Mrs. Whitney. Your pet, Black Eyes."

"Oh, I don't believe it!"

But Judd said, "Go ahead, Dr. Jamison. I'm listening."

"Well, how does an animal—any animal—protect itself?"

"Why, in any number of ways. If it has claws or a strong jaw and long teeth, it can fight. If it is fleet of foot, it can run. If it is big and has a tough hide, most other animals can't hurt it anyway. Umm-mm, doesn't that about cover it?"

"You left out protective coloration, defensive odors, and things like that. Actually, those are most important from our point of view, for Black Eyes' ability is a further ramification of that sort of thing. Your pet is not fast. It isn't strong. It can't change color and it has no offensive odor to chase off predatory enemies. It has no armor. In short, can you think of a more helpless creature to put down in those Venusian swamps?"

After Judd had shaken his head, Dr. Jamison continued: "Very well, Black Eyes should not be able to survive on Venus—and yet, obviously the creature did. We can assume there are more of the breed, too. Anyway, Black Eyes survives. And I'll tell you why.

"Black Eyes has a very uncommon ability to sense danger when it approaches. And sensing danger, Black Eyes can thwart it. Your creature sends out certain emanations—I won't pretend to know what they are—which stamp aggression out of any predatory creatures. Neither of you could fire upon it—right?"

"Umm-mm, that's true," Judd said.

Lindy nodded.

"Well, that's one half of it. There's so much about life we don't understand. Black Eyes uses energy of an unknown intensity, and the result maintains Black Eyes' life. Now, although that is the case, your animal did not live a comfortable life in the Venusian swamp. Because no animal would attack it, it could not be harmed. Still, from what you tell me about that swamp ...

"Anyhow, Black Eyes was glad to come away with you, and everything went well until you landed in New York. The noises, the clattering, the continual bustle of a great city—all this frightened the creature. It was being attacked—or, at least that's what it must have figured. Result: it struck back the only way it knew how. Have you ever heard about sub-sonic sound-waves, Mr. Whitney, waves of sound so low that