Scattered at considerable distances, one from the other, these rulers of their little principalities were loosely bound into a general government; but at home each was a law unto himself. They lived in princely fashion, these lords of the castle, as they were called. Among the retainers, monogamy was practiced. The workers had their little families--husband, wife and children. But for the rulers, more than one wife was the rule. Within each castle was a harem of beauties, drawn perforce from the common people. The most beautiful girls of each settlement were trained from childhood to anticipate the honor of being selected by the master for a life in the castle. They were connoisseurs of woman's beauty, these overlords. By the size of his harem and the beauty and talent of its inmates was an overlord judged by his fellows. Out of this had grown the principal cause for war in the history of the realm. Beautiful girls were scarce. Raids were made by one lord upon the village and harem of another. Then had come to Tako the discovery of the great world of our Earth, occupying much of this same space in another state of matter. "I discovered it," he said with his gaze upon Jane. "How?" Don demanded. "It came," he said, "out of our scientific method of transportation, which very soon I will show you. We are a scientific people. Hah!" He laughed ironically. "The workers say that we princes are profligate--that we think only of women and music. But that is not so. Once, many generations ago, we were a tremendous nation, and skilled in science far beyond your own world--and with a population a hundred times what we have now. The land everywhere must have been rich and fertile. There were big cities--the ruins of them are still to be seen. * * * * * "And then our climate changed. There was, for us, a world catastrophe, the cause and the details of which no one now knows very clearly. It sent our cities, our great civilizations into ruins. It left us with this barren waste with only occasional lowland fertile spots which now by heredity we rulers control, each to possess his own. "But that past civilization gave us a scientific knowledge. Much of it is lost--we are going down hill. But we have some of it left, and we profligate rulers, as the workers call us, cherish it. But what is the use of teaching it to the common people? We do very little of that. And our weapons of war we keep to ourselves--except when there is a raid and our loyal retainers go forth with us to do battle." "So you discovered how to get into our Earth world?" Don repeated. "Yes. Some years ago, and it was quite by chance. At first I experimented alone--and then I took with me a young girl."