Telescopes, early, 96 Thales, 7, 140, 317 Thomson, Sir William, 367, 372, 373, 378, 394 Tide-gauge, described, 373, _seq._ Tides, 354, _seq._ Time, is not exactly uniform, 384 Torricelli, 133, 168 Tycho, see Brahé, Tycho V Vinci, Leonardo da, 9, 100, 144, 184 Viviani, 133, 168 Voltaire, 181 W Watson, Prof., 300 Whewell, 227 Wren, Sir Christopher, 188, 192, 193, 197 Z Zach, Von, 296, 299 Zone of Asteroids, 300, _seq._ THE END. RICHARD CLAY AND SONS, LIMITED, LONDON AND BUNGAY.