GENERAL INDEX 



Two Pseudo-Sciences Alchemy 

 and Astrology, Chapter VI, 

 2, 124. 



Tycho Brahe, great Danish as- 

 tronomer, 2, 65; observation 

 of comets, 2, 67; method of 

 finding latitude, 2, 68; re- 

 discovery of "moon's varia- 

 tion," 2, 69; explanation of 

 the new star in Cassiopeia, 2, 

 69. 



Tyndall, John, a recruit to the 

 Darwinian theory, 4, 175; 

 corroborates the results of 

 Pasteur as to the non-exist- 

 ence of spontaneous genera- 

 tion, 4, 1 80. 



UNIVERSITIES in the thirteenth 

 century, 2, 43- 



University College, London, Dr. 

 Ramsay's labors in, 5, 82. 



University of Jena, 5, 148-150; 

 freedom of thought and ex- 

 pression at, 6, 158. 



Unsolved Scientific Problems, 

 Some, Chapter VIII, 5, 203. 



Uranium, discovery of the radio- 

 active properties of, 6, 100. 



VALVES of the veins, con- 

 troversy about them in the 

 sixteenth century, 2, 166. 



Van Beneden, discovery of the 

 centrosome, 6, 226. 



Van Berquen, his discovery 

 that by a certain arrangement 

 of the facets on a diamond 

 the reflection and dispersion 

 of light are greatly increased, 



9, 305- 

 Van Depoele, the inventions of, 



7, 185. 

 Van Helmont, Jan Baptista, 



founder of medical system, 2, 



185. 

 Van 't Hoof's studies of the 



space relations of atoms, 6, 



210. 

 Van Niekirk, Schalk, part taken 



in the discovery of South 



African diamonds, 9, 315. 

 Van Siegen, invented the form 



of metal-engraving known as 



mezzotint, 8, 196. 



Varley, constructed a dynamo- 

 electric machine, 6, 178. 

 Varnishes, 8, 316. 

 Vauconson, M., a Frenchman 



who suggested plans for a 



power-loom, 9, 43. 

 Vegetables, respiratory organs 



of, 4, 94; cell walls of, 4, 124. 

 Ventilation, problems in, 6, 200; 



in mines, 6, 253. 

 Venus, phases of the planet 



discovered by Galileo, 2, 79. 

 Verneuil, M., his experiments 



with artificial gems, 9, 332. 

 Vesalius, Andrew, "the greatest 



of anatomists," 2, 164. 

 Ville de Orleans, the famous 



voyage made by the, 7, 259. 

 Vinci, see Leonardo da Vinci. 

 Viper, wrecking of, possibly 



caused by gyroscopic action, 



7, 222. 



Virchow, Rudolf, demonstrates 

 the correctness of Von Mohl's 

 cell formation, 4, 127; the 

 discoveries of, 6, 188; his 

 work in pathology, 6, 189; his 

 ways of living and working, 5, 

 190; his method of teaching, 

 6, 191, 192. 



Vitalists' system, 4, 185; theory 

 of, 4, 186. 



Vitruvius, warns the Romans 

 against elaborately carved 

 cornices, 9, 150. 



Volta, Alessandro, inventor of 

 the "voltaic pile," 3, 230; his 

 discovery payed the way for 

 the electric light, 6, 220. 



Voltage, theoretical explana- 

 tion of high and low, 6, 200. 



Von Alteneck, introduced drum 

 arrangement of armature, 6, 

 179. 



Von Baer, Karl Ernst, studies in 

 embryology, 4, 122. 



Von Empergner, discovered that 

 metal embedded in concrete 

 is protected from rust, 9, 

 198. 



Von Guericke, Otto, inventor of 

 air-pump, 2, an; demon- 

 stration of atmospheric pres- 

 sure by the striking experi- 



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