KEY AND INDEX 



Thorium, discovery of the radio- "Trophic centres," Waller and 



active properties of, 5, 100. the study of, 4, 280. 



Thundering Legion, the, 1, Trotula, a perhaps mythical 



woman physician, 2, 29. 



Trowbridge, Prof. J., experi- 

 ments relating to the trans- 

 mission of messages by wire, 

 8, 49- 



Tucker, Stephen D., invented a 

 rotating folding cylinder that 

 folded papers as fast as the 

 presses could print them, 8, 

 130. 



Tungsten lamp, 6, 234. 



Tungsten steel, 6, 297. 



Tuke, Dr. William, leader in re- 

 forms for care of insane, 4, 245. 



Tunis, Howard Hansel, satis- 

 factory monorail system in- 

 vented by, 7, 193. 



Turbine steam-engine, first pro- 

 posed by Branca (1629), 6, 

 87; Mr. C. A. Parsons' in- 

 vention of, 6, 124; its use on 

 the Turbinia, 6, 124; its 

 application to ocean steamers, 



6, 125; detailed description 

 of, 6, 126; its efficiency as 

 compared to reciprocating 

 engine, 6, 126; estimate of, 

 by the London Times, 6, 127; 

 as used on Lusitania, 6, 128; 

 its use in America as re- 

 ported by Mr. Edward H. 

 Sanborn, 6, 129; its use in 

 foreign countries, 6, 130; of 

 Dr. Gustav De Laval, 6, 131; 

 the use of, on ocean steamers, 



7, 82. 



Turbine water-wheels, invention 

 of; replaces earlier types of 

 water-wheels, 6, 72; new 

 types of, 6, 73; used in gen- 

 erating electricity at Niagara 

 Falls, 6, 187. 



Turbinia, first steamship 

 equipped with turbine engine, 

 1897, 6, 124; its speed as- 

 tonished the nautical world, 

 7, 81. 



Turner, James, invented "Tur- 

 ner's yellow," 8, 283. 



Turpin, studies of micro-organ- 



296. 



Tisandier brothers applied the 

 electric motor to a balloon, 7, 

 264. 



Tolstoi, Count Leo, his fondness 

 for physical work an eccen- 

 tricity, 6, 27. 



Tongs, lever of the third class, 

 6, 31. 



Tools, man the tool-making 

 animal, 6, 6-8. 



Torricelli, disciple of Galileo, 2, 

 120; discovers that "suction " 

 is air pressure, 2, 120; 6, 65; 

 his barometer, 2, 122; discov- 

 ery in hydraulics, 2, 123. 



Townsend, M., inventor of the 

 "latch needle" for knitting- 

 machines, 9, 57. 



Toxine, anti-, the discovery of, 

 for tetanus and diphtheria, 4, 

 242. 



Transformers, electrical, 6, 198. 



Transmission of power, by 

 means of gears, belts, chains, 

 6, 35; by electricity, 6 ? 194- 



Transmutation of species, 4, 

 149, 150, 152, 153, 159, 161, 

 167, 170, 174, 176. 



Treadle, lever of the third class, 

 6, 31- 



Treadmill, modified form of 

 lever, 6, 58. 



Treviranus, Gottfried Reinhold, 

 motion of cell contents, redis- 

 covered in 1807 by, 4, 124; 

 coined the word "biology," 

 4, 160. 



Trevithick, Richard, his pump- 

 ing-engines, used by Boulton 

 and Watt, introduces high- 

 pressure engine, introduces 

 steam-propelled road vehicles, 



6, 113; planned an iron ship, 



7, 75; the locomotive of, 7, 

 12 1 ; the automobile of, 7, 

 159- 



Trichina spiralis, Owen's dis- 

 covery of, 4, 207. 



Trichinosis, the subject of, 4, 

 207. 



ism, 4, 219. 



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