776 



INDEX. 



sity, i. 239 ; ' Life of Dalton,' 246 ; 

 on Charles Bell, 292. 

 Heraclitus of Ephesus, i. 314 ; the 

 "kinetic theory," 385 ; conception of 

 eternal motion, ii. 3 ; conception of 

 changing world-periods, 286. 

 Herapath, "mechanical theorv of 



gases," i. 310; 434. 

 Herbart repudiated by Lotze, i. 49 ; 

 208 ; educational influence of, in 

 Germany, 257 ; phrenology, ii. 478 ; 

 anticipated Helmholtz, 491 ; influ- 

 ence of his philosophy, 494 ; on 

 "faculty -psychology," 495; psycho- 

 logical research, 496 ; mathematical 

 psychology, 498 ; 500 ; psychical 

 mechanism of, 504 ; space percep- 

 tion, 506 ; 507, 512, 515 ; introspec- 

 tive method, 527; " Volkerpsych- 

 ologie " and " Sprachwissenschaft, " 

 530. 

 Herbert, Dean, natural selection, ii. 



330. 



Herder, i. 50 ; History of Humanity, 

 51; 'Ideen,' 53; 'Metakritik,' 83; 

 indebtedness to Gibbon, 169 ; 171 ; 

 cited on Georg Forster, 179 ; scien- 

 tific ideal of, 211 ; 212 ; Alcaic and 

 Sapphic metres, 213 ; educational 

 influence of, in Germany, 257 ; 258 ; 

 scientific work of, ii. 210 ; influence 

 of, 225 ; 280 ; philosophy of, 346 ; 

 psycho-physical view of nature, 531 ; 

 quoted. 533; 'History of Mankind,' 

 534 ; 538, 563. 



Heredity, problem of, ii. 343, 613. 

 Hering, ii. 442 ; ' Ueher das Gedacht- 

 niss als eine allgemeine Funktion der 

 organischen Materie,' 544. 

 Hermann, Gottfried, indebtedness to 

 Bentley, i. 169; 162, 172; science 

 for its own sake, 211 ; 212, 214 ; 

 classical learning of, 222. 

 Hermann, Jac., Leibniz's letter to, 



quoted, ii. 646. 



Hermite, researches of, ii. 124 ; 649 ; 

 on determinants, 683 ; on transcend- 

 ent numbers, 731. 

 Herodotus referred to on division of 



History into centuries, i. 13 ; 296. 

 Herrmann, Or., quoted, ii. 266. 

 Herschel, Caroline, discovers her eight 



comets, i. 229 ; 285. 



Herschel, Sir John, i. 177 ; quoted on 

 Laplace, 123 ; astronomical work of, 

 230 ; introduction of knowledge of 

 Continental mathematics to Cam- 

 bridge by, 233 ; science in England, 

 234 ; 236 ; and Airy, article in 



'Encyclopaedia Metropolitana,' 236; 

 quoted on Fresnel, 241 ; educational 

 movement promoted by, 261 ; ' A 

 Preliminary Discourse on the Study 

 of Natural Philosophy,' 263, 306 ; 

 founded Analytical Society, 271 ; 

 spectrum analysis, 278 : stands on 

 Bacon's philosophy, 307 ; 376 ; 

 phenomenon of fluorescence observed 

 by, ii. 52 ; criticism of the term 

 " potential energy, " 140; 29o ; 'In- 

 troduction to the Study of Natural 

 Philosophy,' 32S ; experiments at the 

 Cape, 357 ; "sound," 488 ; theory of 

 probabilities, 569 ; 606. 

 Herschel, Sir William, ' On the Proper 

 Motion of the Sun and Solar System,' 

 i. 176 ; astronomical discoveries of, 

 229 ; 238, 285 ; discovery of Uranus, 

 324 ; ' Observations of Nebulae,' ii. 

 283 ; nebular theory, 295. 

 Hertwig, 0., 'The Cell,' ii. 224, 265, 

 297, 370, 371, 373, 420, 427, 444, 461 ; 

 embryological researches, 228 ; ' The 

 Biological Problem of To-day,' 298, 

 459 ; ' Zeit und Streitfragen zur 

 Biologie,' 401; quoted, 409; 'The 

 Cell,' quoted, 425, 446, 448; "idio- 

 plasma," 448; "organicisme," 455. 

 Hertz, H., electric theory, i. 344 ; elec- 

 trical wave-motion, ii. 77 ; electrical 

 view of light, 88, 92; "physical 

 mechanics," 101; electro - magnetic 

 wave-motion, 148 ; 193. 

 Hess, a founder of physical chemistry, 



ii. 152 ; 157. 



Hesse, Otto, his elegant work, ii. 677 ; 

 introduces determinants, 682 et seq. ; 

 and invariants, 684. 

 Hessel, 'Krystallometrie,' i. 44~3. 

 Hettner, history of the idea of humanity, 

 i. 50 ; literary history of the eigh- 

 teenth century, 59 ; cited on Georg 

 Forster, 179. 

 Heun, ' Jahresbericht der deutschen 



Mathematiker-Vereinigung,' ii. 101. 

 Heussler, Hans, on Bacon, i. 94. 

 Heyne of Gottingen University, i. 165 ; 



indebtedness to Bentley, 169. 

 Hicks, ' Eeport on Hydrodynamics,' ii. 

 58 ; contribution to vortex theory, 

 63. 



Higgins, theory of, i. 398. 

 Hilbert on algebraic numbers, ii. 729. 

 Hildebrand, Bruno, statistics, ii. 561. 

 Hillebrand, Karl, 'Zeiten, Volker, und 



Menschen,' quoted, i. 311. 

 Hippeau, C. , ' Public Education during 

 the Eevolution in France,' quoted, i. 



