His education and experience were Earthly. He knew no more of Mars than we did. Yet, now that he was here and probably at home, did difference of physical structure and emotion make him feel that the rest of us were enemies, forever too different for friendly contact? My hide began to pucker. * * * * * High in the sky, some kind of aircraft glistened. On the distant turnpike there were the shining specks of vehicles that vanished from sight behind a ridge shaggy with vegetation. Miller had a tight, nervous smile. "Remember, men," he said. "Passivity. Three men can't afford to get into a fight with a whole planet." We put on spacesuits, which we'd need if someone damaged our rocket. It had been known for years that Martian air was too thin and far too poor in oxygen for human lungs. Even Etl, in his cage, had an oxygen mask that Klein had made for him. We had provided him with this because the Martian atmosphere, drifting away through the ages, might be even leaner than the mixture we'd given Etl on Earth. That had been based on spectroscopic analyses at 40 to 60 million miles' distance, which isn't close enough for any certainty. Now all we could do was wait and see what would happen. I know that some jerks, trying to make contact with the inhabitants of an unknown world, would just barge in and take over. Maybe they'd wave a few times and grin. If instead of being met like brothers, they were shot at, they'd be inclined to start shooting. If they got out alive, their hatred would be everlasting. We had more sense. Yet _passivity_ was a word that I didn't entirely like. It sounded spineless. The art of balancing naive trust exactly against hard cynicism, to try to produce something that makes a little sense, isn't always easy. Though we knew something of Martians, we didn't know nearly enough. Our plan might be wrong; we might turn out to be dead idiots in a short time. Still, it was the best thing that we could think of. The afternoon wore on. With the dropping temperature, a cold pearly haze began to form around the horizon. The landscape around us was too quiet. And there was plenty of vegetation at hand to provide cover. Maybe it had been a mistake to land here. But we couldn't see that an arid place would be any good either. We had needed to come to a region that was probably inhabited. We saw a Martian only once--scampering across an open glade, holding himself high on his stiffened tentacles. Here, where the gravity was only thirty-eight percent of the terrestrial, that was possible. It lessened the eeriness a lot to know beforehand what a Martian looked like. He looked like Etl. * * * * *