324 



Index 



PAGE 



Davy's lamp - - 116 



Deacon, H. - 198 

 " De Different/us Animal - 



ium" - - 257 



Degradation of energy - 30 



Delabeche, Sir H. - - 315 



Delambre 60, 63 



De la Rive - 39 



DelaRue, W. - - 169 



De la Tour, C. - - 140 



Deluc - - 66 



De Mayerne, Sir T. T. - 296 



Democritua - 14 



De Morgan, A. - - 143 



Desaguliers, J. T. - - 71 

 Descartes, R. - - 12, 49, 120 

 Dewar, Sir J. : 



Cordite, invention of - 202 

 Liquefaction of gases 140, 213 

 Solidification of hydro- 

 gen - 146 

 Spectrum analysis - 159 

 Diamond, nature of - - 115 

 Differential calculus - 49, 53 

 Notation - - 117 

 Diffraction - 19 

 Digby, Sir K. - - 225 

 DiUenius, J. J. - - 251 

 Diluvial deposits - 318 

 Dispersion of colours- 58, 98 

 Dissipation of energy - - 29 

 Dodo - 261 

 Dollond, J. - 98, 205 

 Dryander - - 242, 244 

 Dufay - - 79 

 Dyeing industry 194, 199-201 

 Dyer, G. - - 197 

 Dynamo machine - 192, 193 



Earth: 



Density of - 

 Tremors 



Earthquakes 



Ebonite - 



Edwards, A. M. 



- 64, 86, 87 



- 214 



- 88 



- 190 

 140, 292, 317 



PAGE 



Electric arc - - 114 



Battery - 106, 147, 163 



Spark - 78 



Telegraph - - 187-189 



Theories 31, 33, 79, 81, 182 



Units - - 214 



Electricity, atmospheric - 205 



Conduction of - -71,78 



Discharge through gases 78, 



85, 182 



Early researches 5 



Frictional - -80,81 



in Fishes - - 83 



Industrial applications 



of - - - 187-194 



Law of inverse squares 69, 81 



Medical applications - 300 



Electrolysis - - 21, 107 



Electrolytic production of 



metals - - 113 



Electro -magnet, invention of 148 

 Electro -magnetic : 



Induction - - 20, 191 

 Theory of light - 32, 138 

 Electro -magnetic engine - 24 

 Electrometer - 70 



Electron theory 138, 139, 182 



Electroscope, gold leaf - 80 

 Electrostatics - - 31, 81, 82 

 Ellis, Capt. - 288 



Embryology - - 284, 295 

 Energy : 



Conservation of 8, 22, 28, 135 

 Dissipation of - 29, 30 



Kinetic - - 23 



Potential - 23, 123, 135 

 Transmission of - - 161 

 Engine : 



Dynamo - - 192 



Electro -magnetic - 192 



Steam - 99-105 



Ent, Sir G. - 226 



Erosion, geological effects - 310 

 Eskdalemuir observatory - 209 

 Eugenics - - 277, 280, 286 

 Euler - - 98 



Evelyn, J. - 220, 225, 226 



Evaporation, cooling pro- 

 duced by - - 65 



