INDEX 



477 



Diogenes Laertius, list of Demo- 



critus' works, 132 

 Discours de] la Methode, a work of 



Descartes, 217 



Discoveries, growth of great, 106 

 Discovery, era of maritime, 160 

 Displacement of stellar spectra, 350 

 Dissipation of energy, Kelvin on, 



422 

 Distance of the stars, Herschel's 



method of measure, 390 

 of the planets accurately deter- 

 mined, 232 

 Dollond, perfects the heliometer, 



333 



Dominis, Antonio de, his sentence 

 and fate, 206 



Double stars, Herschel's observa- 

 tion of, 324 

 growing knowledge of, 371 



Doubt, Democritus on necessity 

 of, 134 



Draper, History* of Intellectual De- 

 velopment, 1 1 

 denunciation of Lord Bacon, 215 



Dust, cosmic, Arrhenius on, 395 



Dynamics, foundations laid by 

 Galileo, 198 



EARTH, speed of in space, 22 



doctrine of a round, its antiquity 



when introduced, 64 

 its littleness proved by bisection 



of the heavens, 112 

 pictured as an animal by 



Kepler, 191 

 probable origin, 26 

 rate of revolution compared, 317 

 shadow of, a cone, 67 

 smoothness of, 41 

 third motion of, Coppernicus' 



discovery, 167 



Ebert, explains perplexing appear- 

 ances in stellar collisions, 381 

 Eclipse of the sun and moon, t its 



implications, 91 

 Eclipses, early predictions, 64 

 Electricity, ancient ignorance of, 



139 



Electro-dynamical theory of gravi- 

 tation, 448 



Elements, new, discovered by spec- 

 troscope, 348 

 Ellipses, Kepler's discovery of 



planetary motion in, 187 

 Ellipticity of the earth's orbit 



decreasing, 297 

 Emerson, quotations from, 20, 316 



Empedocles, anticipates Darwin, 63 

 loves and hates among the 



atoms, 139 

 Energy, crudeness of ancient ideas 



of, 139 



of heat, new science of, 415 

 supply of from the impact of 



suns, 452 



England, still outside of European 



civilisation in Newton's day, 262 



Ephemerae, Langley's parable on a 



race, 463 

 Epicurus, idea of the sun, 5 



borrows his philosophy from 



Democritus, 134 

 his rule of life, 218 

 inscription over his garden, 155 

 life and death of, a work by 



Gassendi, 222 

 on chaos, 34 



Epicycles, representation of planet- 

 ary motion, 115 

 Eratosthenes, of Alexandria, his 



measure of the earth, 73 

 inconsistency of his ideas, 1 1 5 

 on different levels of the Mediter- 

 ranean, 121 



on distance of the sun, 93 

 prediction of a new continent, 78 

 Erman, Paul, quoted, 344 

 Error, ancient limits of, 145 

 Ether, suppositions regarding it 



incongruous, 455 



Euclid, permanence of his doc- 

 trines, 9 



epigram on mathematics, 57 

 his geometry still taught, 146 

 his influence on Galileo, 198 

 Eudoxus, crystal sphere of the stars, 



1 06 



Euergetes, Ptolemy, his armils, 95 

 Euler, contributions to mathe- 

 matics, 295 



Eumenes, collects a vast library, 152 

 Evolution, the scheme of, 12 

 Bruno's idea on, 182 

 idea of, how reached as a world 



picture, 35 

 parallel, of other worlds to our 



own, 363 



Explorers, scientific, as poets, 187 

 Exposition du Systeme du Monde, 

 a work by Laplace, 301 



FALL of bodiesj Aristotle's ideas, 



198 



Faraday, ideas of matter, 137 

 Fatimite Library, at Cairo, 154 



