TNDEX. 



TOWER 



Tower, Hunter dissects the wild beasts of 

 the, 198 



Transits of Mercury and Venus, 153 ; 

 Halley's method of measuring, 155 ; De- 

 lisle's method of measuring, 277 ; dia- 

 grams of, 156; expeditions, 159 



Trianon, Jardin de, 207 



Tycho Brahe, his life' and astronomical 

 work, 75 ; Galileo and Kepler compared, 



99 



Tychonic system, 75 

 Tylor, E. B., illustrations of refraction of 



"light, 178 

 Tyndall, Dr., on heat, 360 



UNDULATORY theory of light, 175 ; 

 explains interfeience, 318 

 Upsala, Linnaeus's botanical garden at, 207 

 Uranienburg, Tycho's observatory at, 76 

 Uranus, discover}' of, 281 ; had been ob- 

 served by Flamsteed, 282 ; its irregular 

 movements lead to discovery of Neptune, 

 34 



WACUUM, Torricellian, 118 

 Valleys, excavation of, n 



Valves in veins discovered by Fabricius, 

 109 ; use of. 109 



Van Helmont, chemistry of, 70 



Varieties, useful ones alone survive, 468 



Vasco de Gama sees southern stars, 57 



Vegetable anatomy, 137 



Ve ns, Galen on, 34 ; action of, discovered 

 by Harvey, 109 ; valves in, discovered 

 by Fabricius, 109 



Velocity of light measured, 172 



Venus, phases of, agree with Copernican 

 theory, 89 



Venus, transits of, 153 ; used to measure 

 sun's distance, 156; Halley's method of 

 measuring, 155 ; diagrams illustrating, 

 157 ; Delisle's method of measuring, 276 



Vertebra ta, term explained, 433 



Vesalius, his work in anatomy, 65 ; ban- 

 ishment and death of, 66 



Vessels and fibres of plants, 137 



Vesta discovered, 300 



Vibrations, light a series of, 176; of light 

 complex, 326 ; calculation of musical, 263 



Vinci, Leonardo da, inventions of, 58 



Vital fluids, belief of alchemists in, 192 



Vitellio on refraction, 104 



Viviparous and oviparous animals, 140 



Volcanoes, Pythagoras on, 12 ; mass of 

 lava thrown out irom, 445 



Voltaic electricity, 259 ; pile, 261 



Volta on electricity, 257 ; his crown of 

 cups, 260 ; his controversy with Galvani, 

 259 



Volume and pressure, relations of, 120 



Von Baer on embryology, 437 



Voyages round the world, 56 



ZOOLOGY 



Vukar. god of Volcanoes, 7 

 Vulcanists and Neptunists, 217 



"\ A 7ALES, moraines and erratic blocks 



vv of, 451 



Wallace, Mr. A. R., figures drawn by, 95 ; 

 on natural selection, 463 ; on prolificness 

 of birds, 466 



Wallis, Dr., his description of the Royal 

 Society, 123 



Washington, telescope at, 310 



Water, composition of, 392, 403 ; rising in 

 a vacuum, 114; latent heat of, 240; 

 boiled by friction, 352 ; rise of tempera- 

 ture in, by friction, calculated, 356; de- 

 composed by sodium, 403 



Watson, Professor, on new planets, 312 



Watt, his early life, 242 ; not the first to 

 make a steam-engine, 244 ; his separate 

 condenser, 247 ; his double-acting engine, 

 250; his partnership with Boulton, 250 



Wave-theory of light, 175 ; explains inter- 

 ference, 318 



Waves of light in a crystal, 326 



Weber cited, 382 



Wedgwood, Dr. T., on sun-pictures, 331 



Weight of bodies explained by gravitation. 

 151 ; of chemical elements, 401 



Weissmann on continuity of germ plasma, 

 44 



Wenzel on law of definite proportions, 400 



Werner on rocks and fossils, 216 



Wheatstone on musical vibrations, 274 ; 

 patents electric telegraph, 382 



William of Orange founds Leyden Univer- 

 sity, 191 



Williamson, Prof., cited, 410 



Willughby and Ray, 139 ; on classification 

 of animals, 138 



Winnecke's comet, spectrum of, 345 



Wohler on chemistry of organic compounds, 

 408 ; cited, 410 



Wolff on metamorphosis of plants, 415 



Wollaston, Dr., observes dark lines in the 

 spectrum, 333 



Woodward, his geological collection, 215 



World, first voyages round the, 56 



Worm, regrowth of divided parts of the, 201 



Wiirtz, Professor, cited, 410 



Y 



EAR, length of, calculated, 45 

 Young, Dr., his life, 316 ; on inter- 



ference of light, 319; end Fre'snel en 

 polarization of light, 324; his theory of 

 colour, 328 



ZODIAC, or circle of animals, 19 

 -^ Zoology, Aristotle on, 16 ; Gesner on, 

 67 ; Ray and Willughby on, 138 ; Lin- 

 naeus on, 207 ; Cuvier, St. Hilaire, and 

 Lamarck on, 426 et seg. \ Darwin on, 463, 

 recent advances in, 474 



(1) 



OF THE 



UNIVERSITY 



