BIOGRAPHICAL INDEX 



about 372 B.C. ; died 288 or 287 B.C. Greek phi- 

 losopher. He was a disciple of Aristotle. Be- 

 cause of his work on botany, called "The Natural 

 History of Development," he is called the "father 

 of botany." 



Thompson, Benjamin. (See Count Rumford.) 



Thomson, Prof. J. J., v, 92. Born near Man- 

 chester, Dec. 18, 1856. English physicist. Pro- 

 fessor of Physics, Royal Institution, London, 

 since 1905. Especially noted for his researches 

 in electricity and magnetism, and his exhaustive 

 writings on these subjects. May be said to be 

 the discoverer of the negative "electron," or unit 

 "corpuscle" of electricity. 



Thomson, Thomas, iv, 44. Born at Crieff, 

 April 12, 1773; died near Holy Loch, July 2, 1852. 

 British chemist. He discovered a large number 

 of chemical compounds, such as chlorochromic 

 and hyposulphurous acid, and many salts. 



Thomson, William. (See Lord Kelvin.) 



Torricelli, Evangelista, ii, 120. Born at Pian- 

 caldoli, Italy, Oct. 15, 1608; died at Florence, 

 Oct. 25, 1647. Italian mathematician and physi- 

 cist. He was a friend of Galileo, and his succes- 

 sor as professor at Florence. He is remembered 

 particularly for his invention of the barometer 

 in 1643. 



Treviranus, Gottfried Reinhold, iv, 159. Born 

 at Bremen, Feb. 4, 1776; died Feb. 16, 1837. Ger- 

 man naturalist. He was one of the early workers 

 in biological fields, and one of the first to suggest 

 the name "biology" for that science. 



Trevithick, Richard, vi, 103; vii, 75. Born at 

 Cornwall, England, April 13, 1771 ; died April 22, 

 1833. Engineer and inventor of the locomotive. 



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