198.Theodosius,273.Theodotus,214.Theophrastus,167,241.Thessaly,237.Thrace,237.Θυρωρειον,186.Tiber,231.Tigris,231.Timaeus,241.Timavo,231.Timber,58f.f.Timotheus,54,199.Tivoli,233;stone quarries of,49.Tortoise,311f.f.;of battering ram,310;Hegetor's,312f.f.Torus,90.Towers, construction of,22f.;dimensions of moveable,310.Tralles,212;palace of brick at,53;colonnades at,154;temple of Aesculapius at,198.Treasury, location of,137.Trichalca,74.Triglyphs, origin of,107f.f.;arrangement of,109f.,113;size of,112.Trispast (hoisting machine),285.Τροχἱλος (scotia),90.Troezen,54,234.Troy,195,211,237.Trypho, Alexandrine architect,317f.Tufa, its qualities,49.Tuscan, cavaedium,176;temples,120f.Twins (constellation),266.Tyana,235.Tympanum,96,122;water tympanum,293.Tyre,309.Ulysses,211.Universe, definition of,257.Varro, M. Terentius,199,256.Vaultings,205f.f.Vejovis, temple of,124.Velian country, acid springs of,238.Venter (κοιλἱα),245.Venus, Corinthian order appropriate to,15;site of temple of,31;temple of,54.Venus (planet),259.Verdigris,219.Vergiliae,189.Vermilion,213,215;preparation of,216.Vesta, altar of,125.Vestorius,218.Vesuvius,46,47.Via Campana,238.Vinegar a solvent of rocks,239.Violets used for purple colour,220.Virgin (constellation),265.Vitruvius, education,13,168;personal appearance,36;method of writing,197f.f.;military service,3;his basilica at Fano,134f.f.Voice, defined,138f.;pitch of, determined by climate,171.Volutes,93.Voussoirs,190.Vulcan, site of temple of,31.Walks, how to be constructed,156;serve practical purpose,156.Walls, material for,24;methods of building,51f.f.,56;of brick are durable,53;of rubble,53.Warden (constellation),265.Water (constellation),268.Water,225f.f.;indispensable,226;how to find,227f.f.;properties of,232f.f.;tests of good,242;methods of conducting,244f.f.Water clocks,273f.f.Waterman (constellation),266.Water organ,299f.Water pipes,244f.f.Water screw,295f.f.Water wheels,294.Wattle and daub,57f.Weather prognostics,269f.f.Wells,244f.f.Whale (constellation),267.Wheel (treadmill),286f.White lead,219,238f.Willow,60.Winds, names and number of,26f.f.;diagrams of,29f.;orientation of cities with reference to,24f.f.Wine, given its flavour by soil and water,236;lees used to make black,218.Wine rooms,184.Xanthus,237.Xenia,187.Xenophanes,195,269.Ξυστὁς,161,188.Xuthus,103.Xysta (παραδρομἱδες),161,188.Yellow ochre,220.Zacynthus,235.Zama,240.Zea, spring at,239f.Zeno,195.Zodiac,257f.f.Zoilus (Homeromastix),197.