His expert knowledge of precious stones enabled him to display magnificent jewels and he often discoursed learnedly on their speed, refraction and temper, much as lovers of gems have done in every age since. Alcamayn wore amethysts for luck, and usually a tunic of ochre yellow richly trimmed with peacock feathers and silk fringes. His head-piece was a high cap of white lambskin. On his feet were jeweled sandals and chamois leggins were met at the knee by a full short cotton skirt, having the figures of the zodiac embroidered around the hem in a bewildering mixture of brilliant hues. On the sides of Lone Mountain, which the men were rapidly approaching, were several small mounds, still plainly indicated. Deep tanks were hollowed out on the top of each of these, having the circular bottom and sides lined with cement and filled with filtered water. In addition to serving as observation pools for the sidereal system, these tanks furnished drinking water for the cavalry and infantry camps situated on the right and left hand side of the main buildings. A circular tower of red sandstone and brick rose in the center of the mountain itself. On the inside was a stone stairway, having landings at the various windows, where there was room enough for such lenses and apparatus as was necessary to fully observe the moon and stars imaged in the pools below. The reflection of the sun in these pools marked the hours of the day and time was very sensibly measured by studying the sidereal system. By a nice adjustment, the lenses revolved with the earth’s real motion. The Atlantians and all of their descendants studied the reflection of the planets and stars in a pool of filtered water sunk below the earth’s surface. The tower tapered toward the top, and under an eight-sided pyramidal roof hung a massive copper bell, which was struck to proclaim the hours. Around the circle were chime bells, one for each of the five-note scale; and these were so grouped that by hearing them one knew which temple service was indicated. When it was time to go to a temple, these bells were rung continuously twelve strokes; then a full interval of rest when the process was repeated three times. The “Voice of Tlamco” as the huge central bell was called, rang at dusk, warning all pedestrians to go to their dwellings. Licensed healers of the priestcraft and patrols were the only persons allowed on the street at night, except on extraordinary occasions, and then, the “Voice of Tlamco” tolled with wonderful effect. Lower down, covering much of the ground now occupied by San Francisco proper were the ambulance sheds, battering-rams and other paraphernalia used in warfare. These were enclosed by a wall which skirted the water’s edge, not where the sea-wall now is, but as the water-front was known to the founders of Yerba Buena.