verification, 33 Virchow, 21 visual impressions, 252 space, 67, 252 Volga, 203 Voltaire, 537-8 Weber, 117, 515-6 Weierstrass, 11, 212, 432 Whitehead, 472, 481-2 whole numbers, 44 Wiechert, 145, 488 x-rays, 152, 511, 520 Zeeman effect, 152, 196, 317, 494 Zeno, 382 Zermelo, 477, 482-3 zigzag theory, 478 zodiac, 398, 404
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