"Of these five men one is a sentar (biologist), one an ambad (psychologist), one a kalto (chemist), one a kantum (physicist), and one a korgan (soldier). This quintumvirate is called Sanjong (literally, five-king), and the fitness of its members to serve is determined by examinations similar to that which was given you. These examinations are held every two years. Any citizen may take them; any citizen may become one of the Sanjong. It is the highest honor to which a citizen of Havatoo may win, and he may only achieve it through actual merit." "And these men make the laws and administer justice," I remarked. * * * * * Ero Shan shook his head. "There are no laws in Havatoo," he replied. "During the many generations since Mankar we have bred a race of rational people who know the difference between right and wrong, and for such no rules of behavior are necessary. The Sanjong merely guides." "Do you have any difficulty in finding the proper men to form the Sanjong?" I asked. "None whatever. There are thousands of men in Havatoo capable of serving with honor and distinction. There is a tendency to breed Sanjongs among five of the six classes into which the people of Havatoo are naturally divided. "When you become more familiar with the city you will discover that the semicircular area facing the Central Laboratories is divided into five sections. The section next to the river and above the Central Laboratories is called Kantum. Here reside the physicists. There are no caste distinctions between the physicists and any of the other five classes, but because they all live in the same district and because their interests are alike there is a greater tendency for them to associate with one another than with members of other classes. The result is that they more often mate with their own kind--the laws of heredity do the rest, and the breed of physicists in Havatoo is constantly improving. "The next district is Kalto; here live the chemists. The center district is Korgan, the district in which I dwell. It is reserved for the warrior class. Next comes Ambad, the section where the psychologists live; and, last, Sentar, for the biologists, lies along the water front and down the river from the Central Laboratories. "Havatoo is laid out like the half of a wagon wheel, with the Central Laboratories at the hub. The main sections of the city are bounded by four concentric semicircles. Inside the first is the civic center, where the Central Laboratories are situated; this I have called the hub. Between this and the next semicircle lie the five sub districts I have just described. Between this and the third semicircle lies the largest district, called Yorgan; here dwell the common people. And in the fourth section, a narrow strip just inside the outer wall, are the shops, markets, and factories." "It is all most interesting," I said, "and to me the most interesting part of it is that the city is governed without laws."