47 6 



INDEX 



Cleomedes, on measure of the sun, 



94 

 failure to accept Aristarchus' 



ideas, 116 

 proof of littleness of the earth, 



112 



Clerke, number of new stars, 379 

 Clocks, invention of, 243 

 Cogito ergo sum, keynote of Des- 

 cartes' philosophy, 218 

 Colding, discovery of conservation 



of energy, 416 

 Collision of suns is incessant, 378 



of nebulae and suns, 421 

 Colonies, Greek, 102 

 Columbus, his great project, 160 



effect of his discoveries, 163 

 Cometary origin of the planets, 



Buffon's idea of, 404 

 Comets, the terror they once in- 

 spired orbit of, first calculated 

 by Newton, 270 



tails, their enormous length, 273 

 their disintegration into meteor- 



itic swarms, 276 

 Compass, introduction of, 158 

 Comstock, on absorption of light, 



395 



Congregation of the Index, judg- 

 ment against Galileo, 196 



Conical shadow of the earth, its 

 implications, 91 



Conservation of energy, establish- 

 ment of the idea of, 416 



Constantinople, the fall of, 158 



Constellations, fanciful names of, 



99 



Constructive impulse, 18 

 Coppernican theory, injustice of 



the name, 114 

 its truth demonstrated by 



Galileo, 202 

 not put forward as a hypothesis, 



1 66 



system, perfected by Kepler, 191 

 Coppernicus, quotation from, vii, 



162 



his argument against the revolu- 

 tion of the fixed stars, 102 

 his life and ideas, 164 

 proof of littleness of the earth, 



I 12 



Coral polyps, the changes they have 



wrought, 464 



Cordova, Saracen capital, 154 

 Corpuscles, rain of, from candescent 



bodies, 433 

 enormous speed of, 434 



Correlation of forces, a nineteenth- 

 century discovery, 416 

 Cosmic structure, Struve and 



Proctor on, 391 

 dust, Arrhenius on, 395 

 exchange, the, of matter and life, 



429 



Cosmological letters, Lambert's, 387 

 Cosmos, likened to a gas, 397 



eternity of, 424 

 Cosmotheoros, a work by Huyghens, 



245 



Crassus, source of his wealth, 149 

 Creation, the increasing mystery 



of, 398 



primitive ideas of, 401 

 Critical diameter of minute par- 

 ticles, 434 



Crito, speech to Socrates, 458 

 Croll, on stellar collisions, 452 

 Crusaders burn the Tripoli Library, 



154 



Curve of development, 36 

 Cycle of matter, Arrhenius on, 



461 

 Cyril, Saint, the murder of Hypatia, 



153 



DALTON, John, founder of modern 



chemistry, 1 28 



Dante, creates Italian poetry, 159 

 quotation from // Paradiso, 304 

 Dark stars, Stoney on number of, 



3.82 

 Darwin, age of discovery of natural 



selection, 406 

 Decimal system, Hindu origin of, 



58 - 



Deer, methods of reasoning in, 9 

 Democritus, of Abdera, inscription 



to, v 



his Diakosmos, 10 

 his doctrines, 15 

 his life and ideas, 131 

 Deneb, its enormous size, 338 

 Density of the sun and planets, 



Buffon's calculation, 404 

 of star spacing, 430 

 Descartes, his life and work, 216 

 anticipated by Democritus, 134 

 ignorant of Kepler's work, 192 

 Kant's paraphrase of, 406 

 Design, in the cosmic order, 16 

 Diakosmos, chief work of Demo- 

 critus, 132 

 Dialogues, Galileo's, a brilliant 



work, 205 

 Dichotomy of the moon, 89 



