"They may not be upon this system; they may have been outsiders, as we are--but I have reasons for believing them to be natives of this system, since they were green. You are as familiar with Osnomian mythology as I am--you girls in particular have read Osnomian legends to Osnomian children for hours. Also identically the same legends prevail upon Urvania. I read them in that lieutenant's brain--in fact, I looked for them. You also know that every folk-legend has some basis, however tenuous, in fact. Now, Dottie, tell about the battle of the gods, when Osnome was a pup." "The gods came down from the sky," Dorothy recited. "They were green, as were men. They wore invisible armor of polished metal, which appeared and disappeared. They stayed inside the armor and fought outside it with swords and lances of fire. Men who fought against them cut them through and through with swords, and they struck the men with lances of flame so that they were stunned. So the gods fought in days long gone and vanished in their invisible armor, and----" "That's enough," interrupted Seaton. "The little red-haired girl has her lesson perfectly. Get it, Mart?" "No, I cannot say that I do." "Why, it doesn't even make sense!" exclaimed Margaret. "All right, I'll elucidate. Listen!" and Seaton's voice grew tense with earnestness. "Visitors came down out of space. They were green. They wore zones of force, which they flashed on and off. They stayed inside the zones and projected their images outside, and used rays _through the zones_. Men who fought against the images cut them through and through with swords, but could not harm them since they were not actual substance; and the images directed rays against the men so that they were stunned. So the visitors fought in days long gone, and vanished in their zones of force. How does that sound?" "You have the most stupendous imagination the world has ever seen--but there may be some slight basis of fact there, after all," said Crane, slowly. "I'm convinced of it, for one reason in particular. Notice that it says specifically that the visitors stunned the natives. Now that thought is absolutely foreign to all Osnomian nature--when they strike they kill, and always have. Now if that myth has come down through so many generations without having that 'stunned' changed to 'killed', I'm willing to bet a few weeks of time that the rest of it came down fairly straight, too. Of course, what they had may not have been the zone of force as we know it, but it must have been a ray of some kind--and believe me, that was one educated ray. Somebody sure had something, even 'way back in those days. And if they had anything at all back there, they must know a lot by now. That's why I want to look 'em up." "But suppose they want to kill us off at sight?" objected Dorothy. "They might be able to do it, mightn't they?"