INDEX, 



457 



EI3N 



on causes of, 33 ; changes of level caused 

 by, 408 



Ebn Junis, Arabian astronomer, 46 



Eclipses explained by Anaxagoras, 13 



Ecliptic or sun's path, how traced out by 

 the Greeks, 18 ; Anaxagoras discovers 

 obliquity of, 21 



Egyptians, early science of, 4 



Eighteenth century, work of the, 434 ; 

 summary of science of, 280 



Elective affinities, Bergmann on, 229 



Electric currents causing magnetic cur- 

 rents, 346 , making electro-magnets, 347 ; 

 power of to conquer chemical affinity, 

 367 



Electrical machines, Guericke's, 123 ; 

 Hawksbee's, 123 



Electric spark observed by Guericke, 124 



Electric telegraph, invention of, 357 ; des- 

 cription and diagrams of, 357-60 ; Bain's 

 set on fire by magnetic storm, 356 ; 

 Morse's and Steinheil's, 357 



Electricity, Gilbert on, 77, 123 ; attraction 

 and repulsion by, 124 ; Du Faye on dif- 

 ferent kinds of, 254 ; Franklin on, 255 ; 

 and lightning, 256 ; positive and nega- 

 tive, 256 ; animal, 259 ; chemical or vol- 

 taic, 261 ; chemical theory of, 367 ; pro- 

 duced by heat, 352 



Electrolysis, discovery of, 364 ; Davy's 

 experiments in, 365 ; Faraday on, 367 



Electro-magnetism, Oersted discovers, 341 ; 

 Ampere on, 345 ; Faraday on, 349 



Electro-magnets made by electric current, 

 347 



' Electron,' root of word 'electricity,' 77 



Elements, sixty-four known, 370 



Ellipses, planets move in, 99 



Embryology, Von Baer's law of, 400 ; con- 

 firms St.-Hilaire's view of homological 

 structure, 401 



Embryos of animals alike in structure, 421 



Emission theorj- of light, 174, 303 



Encke's comet, 290 



Energy, potential and active, 337, 339 ; 

 conservation of, 339, 353 



Engines, history of, 245 ; the Newcomen, 

 246 ; Watt's double-acting, 250 



England, geological map of, by W. Smith, 

 224 



Epidermis studied by Malpighi, 139 



Equinoxes observed by Thales, 9 ; Hip- 

 parchus discovers precession of, 30 



Erasistratus on the brain, 26 



Erratic blocks on the Jura, 413 ; a proof of 

 former extension of ice, 414 



21 



FRENCH 



Eratosthenes lays down first parallel of 



latitude, 27 ; measures circumference of 



the earth, 28 

 Ether, light a vibration of the, 176 

 Euclid, some problems of, invented by 



Thales, 9 

 Euclid discovers that light travels in 



straight lines, 21 

 Eudoxus explains movements of the 



planets, 15 

 Eustachius the anatomist, 68 

 Evolution, theory of, 435 

 Extinct animals, restored by Cuvler, 398 ; 



man contemporary with, 415 

 Eye, Alhazen on the sight of the, 47 ; 



Porta on structure of the, 76 ; Kepler on 



the, 96 



FABRICIUS Aquapendente discoven 

 valves in veins, 1 1 1 



Fahrenheit thermometer, freezing point of, 

 120 



Falling bodies, Galileo on rate of, 80 



Fallopius, the anatomist, 68 



Faraday, history of, 348 ; on rotation of 

 magnets and electric wires, 349 ; on 

 electric current produced by a magnet, 

 351 ; on connection between electricity 

 and chemical changes, 367 



Faust, John, the printer, 55 



Fire-air discovered by Mayow, 132 ; its 

 effect on the blood, 134 



' Fixed air,' Black on, 226-228 ; Berg- 

 mann tests, 230 



Flame consuming * fire-air,' 132; spectra 

 of different kinds of, 321 



Flint implements of Abbeville, 415 



Flint-glass, dispersion of light In, 169 



Flood, attempt to explain fossils by a 

 universal, 215 



Flowers, plants classified by their, 145 



Fluxions, Newton's method of, 148, 153 



Force, convertibility of, 369 ; of gravita- 

 tion, 149 



Fossil animals restored by Cuvler, 327 ; 

 intermediate forms of, 424 



Fossil shells observed by Pythagoras, t i 



Fossils, Gesner on, 70 ; first attempts to 

 explain, 215 ; used by W. Smith for 

 classification, 223 



Franklin's early life, 253 ; his experimenti 

 in electricity, 255 : he proves lightning 

 to be electricity, 256-258 



Fraunhofer's early life, 319 ; lines, 3J0 



French school of chemistry, 239 



