KEY AND INDEX 



versal genius that ever lived. As a scientist he 

 anticipated Copernicus in determining the move- 

 ment of the earth, and made elaborate calcula- 

 tions to prove that the earth moves. He in- 

 vented a dynamometer for determining the 

 traction power of machines and animals, and 

 invented a "steam engine" which "drove a ball 

 weighing one talent over a distance of six 

 stadia. 7 ' He is credited with the discovery of 

 the camera obscura. He observed the deposit 

 of fossil shells in rocks, and drew the correct 

 conclusion that these had been deposited at the 

 bottom of the sea, even though now resting on 

 the tops of mountains. He drew designs for 

 flying machines of the aeroplane type, with bird- 

 like wings. He was so far in advance of the 

 scientific knowledge of his time that his efforts 

 produced few immediate results. 



Lepsius, Karl Richard, i, 27. Born at Naum- 

 berg, Prussia, Dec. 23, 1810; died at Berlin, July 

 10, 1884. German Egyptologist and philologist. 

 His work helped in clearing the field for our 

 present knowledge of ancient Egypt. 



Leucippus, i, 161 ; lived about 500 B.C. Greek 

 philosopher. Originated (with Democritus) the 

 atomic theory of matter. 



Lewes, George Henry, i, 131. Born at Lon- 

 don, April 18, 1817; died Nov. 30, 1878. English 

 philosophical writer. Wrote extensively in many 

 fields of scientific thought, throwing much light 

 on the Greek philosophers, and, in modern times, 

 such scientists as Comte and Goethe. 



Liebig, Baron Justin von, iv, 131. Born at 

 Darmstadt, May 12, 1803; died at Munich, April 

 18, 1873. German chemist. Celebrated for his 

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