INDEX 



230 ; as a lecturer, 273 ; as librarian, 

 40 ; as a mathematician, 188 ; as a 

 teacher, 130 ; birth of, i ; brain of, 

 282 ; certificate from rector, 5 ; choice 

 of medical profession, 9; closing 

 years, 279 ; death of, 282 ; Director 

 of Physico-Technical Institute, 185; 

 early days as surgeon, 25 ; early 

 friends, 6, 10 ; ennobled, 279; essay 

 on energy, 40 ; first marriage, 58 ; 

 second marriage, 187 ; general sketch 

 of career, 16 ; gold medal in honour 

 of, 280 ; improvements on inductive 

 coil, 37 ; inaugural thesis, 14 ; in- 

 vestigations on electricity, 206 ; 

 letter to Ludwig, 90 ; on animal 

 heat, 33, 34 ; on art, 270; on con- 

 bination tones, 160 ; on conservation 

 of energy, 39, 53 ; on colours, 119, 

 124 ; on Du Bois Reymond's theory 

 of muscle current, 108 ; on empirical 

 philosophy, 256 ; on fermentation, 

 28 ; on hay fever, 181 ; on his own 

 work, 286 ; on magnified movements, 

 no; on muscular contraction, 33; 

 on philosophy of Kant, 255 ; on 

 physiological acoustics, 129, 131 ; on 

 principle of least action, 246; on 

 rate of nervous impulse, 59 ; on red 

 and blue and green, 120 ; on relation 

 of physics to physiology, 31 ; on 

 superposition of spectra, 122 ; on 

 vowel tones, 163 J ophthalmoscope, 

 71 ; parentage, i ; personal appear- 

 ance, 283 ; personal characteristics, 

 283, 287 ; philosophical position of, 

 250 j school days, 3 ; speech on re- 

 ceiving medal, 280 ; speech when pre- 

 sented with Von Graefe medal, 86 ; 

 statue of, in Berlin, 280 ; student 

 life, 8 ; surgeon to the Red Hussars, 

 25 ; and Robert Mayer, 50. 



Helmholtz, Robert, reference to, 187. 



Herbart, reference to, 270. 



Hermann, Ludwig, reference to, 89. 



Hermann, Ludwig, on muscle current, 

 109 ; on summation tones, 160. 



Hering, reference to, 13, 119; colour 

 theory of, r27. 



Herschel, Sir John, reference to, 128. 



Heintz, physicist, 10. 



Hertz, Heinrich, reference to, 190, 

 215, 217, 219. 



Hertz, Heinrich, Helmholtz on, 285 ; 

 reference to, 243, 249. 



Hildebrand, crest of Helmholtz by, 

 280. 



Hoffman, reference to, 29. 



Horopter, Helmholtz on the, 172 ; 



Horopter, the, 260. 



Humboldt, Alexander von, reference 

 to, 21, 25. 



Hunter, John, reference to, 12. 

 Huygens, reference to, 114, 239. 

 Hydrodynamics, 194. 



ICE, 222. 



Infant, human, experience gained by, 



258. 

 Italy, King of, reference to, 280. 



JACOBI, reference to, 43 ; on potential 



energy, 243. 



Jaeger, Von, reference to, 82. 

 Jones, Bence, reference to, 91. 

 Jones, Wharton, reference to, 77. 

 Joule, on dynamical equivalent of heat, 



49, 51 ; reference to, 91. 



KANT, philosophy of,2S3 ; on dynamics, 

 237 ; on nature of judgments, 254 ; 

 doctrine of space, 260 ; on the beauti 

 ful, 268. 



Karsten, Gustav, physicist, 10. 



Kelvin, Lord, on thermodynamics, 52 ; 

 friendship with Helmholtz, 92 ; on 

 phase, 150 ; reference to, 165 ; on 

 electricity, 211 ; on ice, 222 ; on dis- 

 sipation of energy, 193 ; on theory of 

 constitution of matter, 196, 198 ; on 

 Faraday, 206 ; on rotational move- 

 ments of ether, 253. 



Kinetic, potential, 247. 



Kirchhoff, reference to, 10, 43, 107, 184 



Klangfarbe, 143. 



Klerker, De, reference to, 230. 



Knots, Professor Tail on, 200. 



Koenigsberger, Leo, reference to, 236 



Konig, Arthur, reference to, 126. 



Konigsberg, 112. 



Konigsberg, University of, 58, 89. 



Kronecker, Hugo, reference to, 90. 



LAGRANGE, reference to, 195, 243. 

 La Hire, reference to, 78. 

 Lamarckian, principle of adaptation. 



256. 



Langenbeck, Max, reference to, 97. 

 Laplace, mathematician, reference to, 



Lavoisier, chemist, reference to, 21, 34, 



Lectures by Helmholtz, 274. 

 Lectures, Helmholtz on, 276. 

 Leeuwenhoek, reference to, 26 

 Leibnitz, reference to, 40, 44 ; on 



dynamics, 46, 52, 230, 237, 243, 252, 



287. 



Linnaeus, reference to, 19. 

 Liebig, reference to, 21, 22, 28. 

 Light, theory of, 114, 116. 

 Lissajous, reference to, 166. 

 Listing, schematic eye of, 102, 178. 

 Lobatschewsky, reference to, 266. 



297 



