KEY AND INDEX 



gested a means of measuring 

 the altitude of astronomical 

 bodies, 7, 20. 



Newton, Sereno, sent to Eng- 

 land to study the workings 

 of cylinder presses, 8, 124. 



New York, the, one of the first 

 twin-screw boats to make 

 ocean records, 7, 81. 



New Zoology, Ernst Haeckel and 

 the, Chapter VI, 5, 144- 



Niagara in Harness, Chapter X, 

 6, 183. 



Niagara, Falls of, number of 

 tons of water falling each 

 hour, 6, 184; electric power- 

 house at, 6, 186; effect upon, 

 by the electric power-houses, 

 6, 192; transmission of elec- 

 trical power from, 6, 194; 

 soda manufactories at, 6, 

 300. 



Niagara, detailed by the United 

 States Government to lay the 

 first Atlantic cable, 8, 34. 



Nicdphore de Niepce, discovered 

 a method of making perma- 

 nent photographs by a crude 

 and complicated process, 8, 

 222; his pictures regarded as 

 the first photographic pic- 

 tures ever made, 8, 222. 



Nicetas, taught that the world 

 is in motion, 1, 216. 



Nicholson, William (with Car- 

 lisle), discovered that a gal- 

 vanic current would decom- 

 pose chemicals in solution, 

 3 2 33j 8, ii ; decomposed 

 water into its elements hy- 

 drogen and oxygen, 3, 233. 



Nicholson, William, cylinder 

 press invented by, 8, 123. 



Nile, floods of, without which 

 civilization would be impos- 

 sible in Egypt, 1, 35. 



Med 



Nineteenth-Century Medicine, 



Chapter VIII, 4, 199. 

 Nineteenth century, conditions 



of existence and methods at 



beginning compared with 



those at end, 6, 19-24. 

 Nippur, expedition to, 1, 59. 

 Nitrate Beds, of Chili, 6, 305. 



[ 202] 



Nitrogen, discovered by Caven- 

 dish, 6, 87; method of ob- 

 taining it from the air, 6 , 303 ; 

 as a plant food, 6, 304; Pro- 

 fessor Birkeland's discovery 

 of a method of obtaining it, 

 6, 306; method discovered 

 by Professors Kowalski and 

 Moscicki, at Freiburg, 6, 306; 

 commercial plant for obtain- 

 ing it at Notodden, Norway, 6, 

 309; Frank and Caro process 

 of nitrogen fixation, 6, 309. 



Noble, Sir Andrew, experiments 

 with cordite in obtaining high 

 temperatures, 6, 315. 



Norman, Robert, "dipping" of 

 the magnetized needle first 

 observed by, 7, 13; at- 

 tempted to overcome the dip 

 of the magnetic needle by 

 applying a balancing appara- 

 tus, 7, 14. 



Northrop, inventor of the per- 

 fected power-loom, 9, 51. 



Notodden, Norway, commercial 

 nitrogen plant located at, 6, 



Novelty, locomotive, descrip- 

 tion of the, 7, 132. 



Nuclei of plant cells, discovered 

 by Robert Brown, 4, 115; 

 Dr. Schleiden brings to popu- 

 lar attention, 4, 118. 



Oceanic, the first ocean grey- 

 hound, 7, 80. 



Oersted, Hans Christian, his 

 experiments to show the ef- 

 fect of an electric current 

 upon a suspended magnetic 

 needle, 3, 236; it showed the 

 close relationship between 

 magnetism and electricity, 

 3, 238; 6, 176; effects of his 

 important discovery, 3, 239. 



Oken, Lorenz, extends the 

 doctrine of metamorphosis to 

 the animal kingdom, 4, 146; 

 his theory of spontaneous 

 generation and evolution of 

 species, 4, 160. 



Oil Engines, Gas and, 6, 132. 



Olbers, Dr., discoverer of the 



