Far down in the valley the natives were celebrating the birthday of Gambrinus, a mythical Flemish king who is credited with the first brewing of beer. The sound of their voices set in motion longitudinal sound waves, and these, traveling through the surrounding medium, met the surface separating two media and were in part reflected, traveling back from the surface into the first medium again with the velocity with which they approached it, as depicted in Fig. 10. This caused the echo for which the Lake of Zug is justly famous. The twilight began to deepen and from far above came the twinkling signals of, first, Böotes, then Coma Berenices, followed, awhile later, by Ursa Major and her little brother, Ursa Minor. "The stars are clear to-night," he sighed. "I wonder if they are visible from the dacite elevation on which SHE lives." His was an untrained mind. His only school had been the Eleatic School, the contention of which was that the true explanation of things lies in the conception of a universal unity of being, or the All-ness of One. But he knew what he liked. In the calm light of the stars he felt as if a uban had been lifted from his heart, 5 ubans being equal to 1 quat, 6 quats to 1 ammat and 120 ammats to 1 sos. He was free again. Turning, he walked swiftly down into the valley, passing returning peasants with their baa-poots, and soon came in sight of the shining lamps of the small but carefully built pooroos which lined the road. [Illustration: "She turned like a frightened aardvark." (Male, greatly reduced.)] Reaching the corner he saw the village epi peering over the tree-tops, and swarms of cicada, with the toothed famoras of their anterior legs mingling in a sleepy drone, like many cichlids. It was all very home-like to the wanderer. Suddenly there appeared on a neighboring eminence a party of guisards, such as, during the Saturnalia, and from the Nativity till the Epiphany were accustomed to disport themselves in odd costumes; all clad in clouting, and evidently returning from taking part in the celebration. [Illustration: "Barnaby Bernard Weenix." (1777-1829.)] As they drew nearer, our hero noticed a young woman in the front rank who was playing folk-songs on a cromorne with a double-reed mouth-piece enclosed in an air-reservoir. In spite of the detritus wrought by the festival, there was something familiar about the buccinator of her face and her little mannerism of elevating her second phalanx. It struck him like the flash of a cloud highly charged by the coalescence of drops of vapor. He approached her, tenderly, reverently. [Illustration: "Why not to Wem?" (From a contemporaneous print.)]