INDEX 



Rowland, H. A., reference to, 210. 



Roux, Le, reference to, 229. 



Royal Institution of Great Britain, 32, 



183. 



Rucker, reference to, 207. 

 Rudolphi, reference to, 76. 

 Rumford, Count, reference to, 32, 47. 



SABINE, General, reference to, 91. 



Saccharomycetes, 26. 



Saccule, 138. 



Schelling, reference to, 20, 268 ; on art 



and science, 272. 



Schleiden, botanist, reference to, 12. 

 Schlemm, canal of, 100. 

 Schopenhauer, reference to, 268. 

 Schroeder, reference to, 29. 

 Schwann, reference to, 12 ; on fermen- 



Thorax, Helmholtz on movements of, 



169. 



Tidal actions, 221. 

 Tone, analysis of, 104. 

 Tones, combination, 159. 

 Tones, compound nature of, 147. 

 Tongue pipes, 161. 

 Tyndall, reference to, n, 221, 273. 



UTRICLE, 138. 



VARIATION, negative, 107. 

 Velten, Olga von, 58. 

 Vibration microscope, 166. 

 Violin, Helmholtz on strings of, 165. 

 Virchow, early friend of Helmholtz, 10. 

 Viscous fluids, 196. 



Vision, conditions of, 92 ; laws of, with 

 one and with two eyes, 173. 



THE END 



299 



Colston &> Coy. Limited, Printers, Edinburgh. 



