768 



INDEX. 



during the early part of the century, 

 i- 75. ^ . 



English character, individualism of, i. 



279 ; changes during last fifty years, 



280 ; love of nature, 284, 286 ; Hankel 

 on, ii. 704, 711. 



Enneper, ' Elliptische Functionen,' i. 

 18.^ 187. 



Entropy, ii. 169 et seq., 181, 594. 



Enumeration, ii. 561. 



"Environment," ii. 314, 430. 



Epicurus, "essential and inherent 

 gravity," i. 340; natural philosophy 

 of, ii. 4. 



Epigenesis and evolution, ii. 298. 



Equations, theory of, Abel, ii. 681 ; 

 general solution of, 687 et seq. 



Equivalents, chemical, i. 399, 



Erasmus, i. 163. 



Erdmann, misprint in his ' Grundriss 

 der Geschichte der Philosophic,' i. 

 50 ; ii. 495, 512. 



Erlsberg, ii. 271. 



Ernest Augustus, Elector of Hanover, 

 i. 158. 



Ernest II., Duke of Gotha, i. 54, 176; 

 patron of the astronomer von Zach, 

 177 ; system of education of, 256. 



Error, element of, i. 323 ; theory of, ii. 

 568, 574. 



Ersch and Gruber, Encyclopasdia of, i. 

 35. 



Eschenburg, representative of encyclo- 

 paedic teaching, i. 38. 



Ether, luminiferous, theory of, ii. 18 ; 

 properties of, 31 ; nature of, 36 ; hy- 

 pothesis of, 37 ; Sir 0. Lodge on 

 nature of the, 38 ; nature of, 40 

 et seq. ; mathematical and experi- 

 mental investigation of, 44 ; an 

 "elastic solid," 54; luminiferous, 

 69, 70. 



Etymology, value of, for history of 

 Thought, 1. 20. 



Eucken, R., on philosophical termin- 

 ology, i. 21, 



Euclid preferred in ^England to Le- 

 gendre, i. 44 ; his works models of 

 scientitic thought, 95 ; 120, ii. 4 ; 

 Proclus on, 634 ; Klein on, 635 ; 718, 

 733. 

 Eudenms of Rhodes, ii. 633. 

 Eudo.xus, Proclus on, ii. 634. 

 Euler, Leonhard, freed analysis from 

 geometrical fetters, i. 103 ; 135 ; 

 competed with T. Mayer, 158 ; 163 ; 

 connection of, with modern science, 

 175 ; 181, 183, 234 ; analytical 

 methods of, 271 ; mathematics, 44 ; 



819 ; lunar theory, 329 ; Newton's 

 gravitation formula, 334 ; " Ur- 

 sache der Gravitation," 341 ; ether 

 theory of gravitation, 343, 346, 351 ; 

 unfavoiu'able to Boscovich's theory, 

 358 ; ii. 7 ; ' Anleitung zur Natur- 

 lehre,'8; the successor of Huygens, 

 16, 17 ; studies in elasticity, 30 ; 

 spectrum analysis, 46 ; psycho-phy- 

 sics, 474 ; 510, 637 ; introduces con- 

 ception of "function," 639 ; 643, 646, 

 648 ; on different mathematical inter- 

 ests, 657 ; 669, 680, 692, 694, 695, 

 721. 



Evelyn, John (see Arundel collection), 

 ii. 564. 



Everett, "character" in music, ii. 489. 



Evohition, ii. 210, 278. 



Ewald, on Humboldt's geological work, 

 ii. 226 ; 253. 



Ewing, 'The Steam-Engine,' ii. 136. 



Exner, 'Repertorium der Physik,' i. 

 323. 



Exploration, the spirit of, ii. 206 et seq. 



Externalisation, ii. 525. 



Fabricius of Acquapendente, teacher of 

 Harvey, i. 282. 



Fagnano, Count, Euler on, ii. 657. 



Falk, Johannes, follower of Pestalozzi, 

 i. 258. 



Faraday, electrical theories of, i. 199 ; 

 electrical researches, 201, ii. 86 ; 

 electrical and other discoveries of, i. 

 230 ; science in England, 236 ; not 

 member of any university, 239, 272 ; 

 and Pllicker, 242 ; neglected in Eng- 

 land, 246 ; studied in laboratory of 

 Royal Institution, 249 ; furnished 

 texts for lectures in German univer- 

 sities, 251 ; at Royal Institution, 

 264, ii. 80 ; educated by Davy, i. 

 265; "lines of force," 266, ii. 68, 

 182 ; not connected with Cambridge 

 mathematical school, i. 266 ; neglect 

 of his writings, 277 ; 279, 297 ; gravi- 

 tation, 344 ; electricity, 345 ; sym- 

 bolism, 347 ; nature of matter, 358 ; 

 discovery of electrical induction, 363 ; 

 method of measuring the electric 

 current, 365 ; electrical action in 

 chemical processes, 366 ; discovery 

 of magnetic induction, 368, 371 ; his 

 influence, 380; discovery of "iso- 

 merism," 406; his attitude towards 

 the atomic theory, 418 ; 431 ; theory 

 of chemical affinity, 452 ; researches 

 of, ii. 35 ; modern view of electrical 

 phenomena, 66; "magnetisation of 



