From where he sat, the roof ridge of Estrey Hall neatly bisected his office window along the diagonal. There was a medium-sized cement dragon frozen in the act of clambering down it. For the tenth time that morning he reminded himself that what had happened last night had really happened. It was not so easy. And yet, when you got down to it, Tansy's lapse into medievalism was not so very much stranger than Hempnell's Gothic architecture, with its sprinkling of gargoyles and other fabulous monsters designed to scare off evil spirits. * * * * * Saylor's nine-o'clock class in "Primitive Societies" quieted down leisurely as he strode in a few seconds ahead of the buzzer. He set a student to explaining the sib as a factor in tribal organization, then put in the next five minutes organizing his thoughts and noting late arrivals and absentees. When the explanation, supplemented with blackboard diagrams of marriage groups, had become so complicated that Bronstein, the prize student, was twitching with eagerness to take a hand, he called for comments and criticisms, and succeeded in getting a first-class argument going. Finally the cocksure fraternity president in the second row said, "But all those ideas of social organization were based on ignorance, tradition, and superstition. Unlike modern society." That was Norman's cue. He lit in joyously, pulverized the defender of modern society with a point-by-point comparison of fraternities and primitive "young men's houses" down to the actual details of initiation ceremonies, which he dissected with scientific relish, and then launched into a broad analysis of present-day customs as they would appear to a hypothetical ethnologist from Mars. In passing, he drew a facetious analogy between sororities and primitive seclusion of girls at puberty. The minutes raced pleasantly by as he demonstrated instances of cultural lag in everything from table manners to systems of notation and measurement. Even the lone sleeper in the last row surprised himself by listening. "Certainly we've made important innovations, chief among them the scientific method," he said at one point, "but the primitive groundwork is still there, dominating the pattern of our lives. We're modified anthropoid apes inhabiting night clubs and battleships. What else could you expect us to be?" Marriage and courtship got special attention. With Bronstein grinning delightedly, he drew detailed modern parallels to marriage by purchase, marriage by capture, and symbolic marriage to a deity. He showed that trial marriage is no mere modern conception but a well-established ancient custom, successfully practiced by the Polynesians and others.