GENERAL INDEX 



Dufay, Cisternay, electrical ex- 

 periments, 2, 267; discovers 

 "vitreous" and "resinous" 

 electricity, 2, 270; established 

 important facts regarding con- 

 duction and insulation, 6, 219. 



Du jar din, contents of cells 

 named "sarcode" by, 4, 124. 



Dumas, Jean Baptiste, his 

 school of physiological chem- 

 istry, 4, 128. 



Dundas, Lord, engaged Syming- 

 ton to build a steam boat to 

 be used for towing, 7, 67. 



Dunlap, J. B., introduced the 

 pneumatic tire, 7, 155. 



Diirer, Albrecht, best known 

 wood engravings made by, 8, 

 188. 



Durouf, his use of the balloon 

 during the Franco-Prussian 

 War, 7, 258. 



Dutartre, the stop cylinder in- 

 vented by, 8, 125. 



Dwelling House, evolution of, 

 9, 133; the cave-dwellers, 

 9, 134; material used in 

 building determined by the 

 natural products at hand, 

 9, 138; methods of construc- 

 tion, and architecture, 9, 140; 

 the use of chimneys, 9, 151; 

 the first glass windows, 9, 1 53 ; 

 different types of roofs, 9, 

 153; ceilings and floors, 9, 

 154; staircases, 9, 155; doors 

 of ancient dwellings, 9, 155. 



Dyes, their origin, composition, 

 and uses, 8, 314. 



Dynamo, The, 6, 171; the 

 mechanism of, 6, 173; com- 

 plex structure of 6, 174; ori- 

 gin of, 6, 176; dynamo- 

 electric machine, constructed 

 by Michael Faraday, 6, 177; 

 Wilde's separately excited, 6, 

 178; introduction of the ring 

 arrangement, 6, 179; amount 

 of loss of energy in, 6, 180; 

 in the electric power plant at 

 Niagara Falls, 6, 187. 



EARL of Stanhope, produced a 

 printing-press having a frame 



made of one piece of cast iron, 

 8, 122. 



Early Greek Philosophers in 

 Italy, The, Chapter VI, 1, 



112. 



Earth, the, ultimate fate of, 5, 

 212; future life of, 6, 213; 

 as a conductor of electricity, 8, 

 48. 



Earth's crust, the, computation 

 as to the age of, 5, 210; es- 

 timated thickness of, 6, 212. 



Eaton, William, inventor of the 

 self-acting mule, 9, 35. 



Ecole Polytechnique, Paris, Dis- 

 covery of " radium " at, 5, 100. 



Economic condition of Europe, 

 its influence on science in the 

 dark age, 2, 6. 



Edison, Thomas A., his inven- 

 tion of the incandescent lamp, 



6, 228; perfected a series of 

 electric-railway motors and 

 locomotives, 7, 182; the stor- 

 age-battery car invented by, 



7, 189; patents a system of 

 wireless telegraphy, 8, 50; 

 improves upon the type of 

 telephone receiver, 8, 83 ; in- 

 vents a microphone trans- 

 mitter, 8, 83 ; inventor of the 

 phonograph, 8, 93; his in- 

 vention of the kinetoscope, 8, 

 251. 



Egg-cell, contents of, 6, 227. 



Egypt, the first dynasty, 1, 31; 

 the building of the pyramids, 

 1, 32; three seasons of, 1, 36. 



Egyptian antiquities captured 

 by the English, 5, 5. 



Egyptian Science, Chapter II, 1, 



25- 



Egyptian science, the summer 

 solstice corresponded with the 

 rising of the Nile, 1, 34; the 

 year divided into twelve 

 months of thirty days each, 1, 

 35; the three seasons, 1, 36; 

 the fixing of New Year's day, 

 1, 37; the difficulties con- 

 cerning the unreckoned quar- 

 ter of a day, 1, 38; efforts to 

 reform the calendar, 1, 40; 

 arbitrary signs of the zodiac, 



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