KEY AND INDEX 



broad flat wick for, invented 

 by Leger, in 1783, 6, 204; 

 adaptation of the Argand 

 form of burner, 6, 205; of 

 Quinquet, 6, 205; Carcel's 

 improvement of Quinquet's 

 lamp, 6, 205; using turpen- 

 tine and known as "Cam- 

 phine" lamp, 6, 206; modern 

 petroleum lamps introduced, 

 6, 206; Safety, of Sir Hum- 

 phry Davy, 6, 249. 



Lane-Fox, an early experimenter 

 with electric light, 6, 228. 



Langen, Herr E. (with N. A. 

 Otto) made important im- 

 provement in piston arrange- 

 ment of gas engine, 6, 136. 



Langley, his early experiments 

 and discoveries, 7, 275; the 

 flying-machine of, 7, 284. 



Lanston, Tolbert, monotype 

 machine invented by, 8, 145. 



Laplace, Pierre Simon, Marquis 

 de, removed the last doubts 

 as to the solidarity of New- 

 tonian hypothesis of uni- 

 versal gravitation, 3, 31; his 

 explanation of the planet- 

 ary system, 3, 32; his con- 

 ception as to the formation of 

 suns and stars, known as the 

 "nebular hypothesis," 3, 35; 

 his reasoning about the ring 

 of Saturn, 3, 38; he thinks 

 comets are strangers to our 

 planetary system, ibid.; ex- 

 plains why the movements of 

 comets escape this general 

 law, 3, 39; thought that the 

 rings of Saturn were solid, 3, 



Lartet, Edouard, his discovery 

 of fossils in the caves of 

 Dordogne, 3, 104. 



Latham, Hubert, his attempt to 

 fly across the English Chan- 

 nel, 7, 294. 



La Tour, Cagniard, discovered 

 pepsin in the gastric juice, 

 4, 129; studies of micro- 

 organism, 4, 218. 



Latitude, measuring a degree 

 of, 7, 34- 



Laudanum, its introduction, 2, 

 190. 



Lavoisier, Antoine Laurent, the 

 founder of modern chemistry, 

 4. 28-36; first blow to the 

 phlogiston theory, 4, 31; ex- 

 periments in respiration, 4, 93. 



Law of Gravitation, Newton and 

 the, Chapter XI, 2, 236. 



Law of valency, 4, 63. 



Lawson, H. J., the geared bi- 

 cycle introduced by, 7, 155. 



Layard, Sir Henry, his excava- 

 tions on the site of ancient 

 Nineveh brought to light a 

 most important collection of 

 tablet books, 8, 103; for 

 fuller account of these docu- 

 ments see 4, 292. 



Lea, Gary, improved the collo- 

 dion-emulsion process, 8, 232. 



Leblanc, Abb6, constructed an 

 instrument for reproducing 

 the human voice, but which 

 failed as a sound-producer, 8, 

 94. 



Lebon, Frenchman who early 

 experimented with illuminat- 

 ing gas, 6, 207. 



Le Bris, the flying-machine of, 

 7, 248. 



Lee, Rev. William, inventor of 

 the knitting-machine, 9, 56. 



Leeuwenhoek discovers bacteria, 

 2, 179. 



Leger, a new type of burner and 

 wick for the oil lamp invented 

 by him in 1783, 6, 204. 



LeGray, glass negatives im- 

 proved by, 8, 229. 



Leibnitz, Gottfried Wilhelm, 

 estimate of his work, 2, 197; 

 theory of monads, 2, 198; 

 president of the Royal Acad- 

 emy of Sciences at Berlin, 



2, 202. 



Leidy, Joseph, found the cysts 

 of trichina in pork, 4, 207; 

 one of the chief explorers of 

 the fossils-beds of America, 



3, 1 06; at least a tentative 

 believer in evolution before 

 Darwin's exposition of the 

 origin of species, 4, 166. 



