I came to attention and said, "Of course. It is natural," for I feared to have him know that I was inattentive even for that short space, and waited for elucidations. "It seems," he went on, "that the tribe was dying out. Helm, who first told me something of it at Buenaventura, was one of those scientists who have to invent a new theory for every new thing they were told of. He said it was either because of eating too much meat, or not enough. I forget which. There had been a falling off in the birth rate. The Tocalinian who had lived with them, and who joined us at the headwaters of the Codajaz, maintained that there had been too much inbreeding. So there was some arrangement by means of which they invited immigrants, as it were. Men from other neighboring tribes were encouraged to join the Tlingas. And they did. The Tlingas had a fat land and welcomed the immigrants. The immigrants on their part expected to have an easy time." "That would make for racial improvement," I hazarded. "Why?" he asked. "The best from other lands would tend to improve their race. That was my idea when I spoke," I said. He laughed quietly. "Something of the same idea that you foster here," he said. "I've laughed at that many's the time. America is this, that and the other; its people are inventive, intelligent, original, free, independent and all the rest of it because it is a result of the best blood of other lands. Eh? Lord, man, how you fool yourself! Can't you see that you would have a far better case if you deplored the fact that we are a result of the worse? All the fugitives, the poor, the ill-educated, the unfortunate, the ne'er-do-wells have been swarming here from Europe for two centuries. Can't you see that no man who could fight successfully against odds in his own country would emigrate? Can't you see that? If you said that we are a people that will allow any active minority to put anything over on us, because we are the result of generations of poor-spirited fugitives who couldn't fight for their personal freedom, you would be nearer the mark." His argument of course was absurd, and at the moment I had no answer ready, though since I have thought of the thing I should have said. As Rounds talked, he grew quieter in his tone. He moved from his place on the window sill and sat on the corner of my desk. I had forgotten my uneasiness at being in the presence of one who had taken his fellow's life. He went on: "When there's a falling birth rate, things change. There are manners and customs evolved that would seem strange to you. There come laws and religions, all made to match current requirements. Celibacy and sterility become a crime. Virginity becomes a disgrace, a something to be ridiculed." "It seems impossible," I said. "No," he said. "You have that in part. You ridicule what you call old maids, don't you?" Again I was too slow with my reply. If I ever meet him again, I shall show him the fallacy of many of his arguments.