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, 14 5- 



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, 



44- 



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. 



