XVI LIST OF ILLUSTRATIONS. 



FIG. PAGE 



240. V\ew of larynx .......... 316 



241. Larynx during vocalisation . . . . . .316 



242. Konig's apparatus 317 



243. Reaction time, pendulum method. (Rutherford.} .... 324 



244. Result obtained with 243. (Rutherford.) 324 



245. Reaction time for touch, sight, hearing. (Rutherford.) . . .325 



246. Reaction time. (Stirling.) ........ 326 



247. Neuramoebimeter. (Obersteiner.) 326 



248. Frog's brain. (Landois and Stirling.) 327 



249. Scheiner's experiment 332 



250. Diffusion. (Helmholtz.) 332 



251. Phakoscope ........... 334 



252. Model of plates of ophthalmometer. (Aubcr.) 334 



253. Apparatus for vision of a point. (Ludwig. ) 337 



254. Mariotte's experiment 338 



255. Mariotte's experiment (another way) . . . . . 338 



256. Blind spot. (Helmholtz.). 338 



257. Vdkmann's experiment on the blind spot ..... 339 



258. Bergmann's experiment. (Helmholtz.) ...... 340 



259. Disc for Talbot's law. (Helmholtz.) 342 



260. Oharpentier's disc for " black band " 343 



261. Charpentier's disc for coloured field 343 



262. Priestley Smith's perimeter 344 



263. Scheme for wheel movements of eye. (Bering. ) 345 



264. Irradiation. (Helmholtz.) 346 



265. Irradiation. (Helmholtz.) 346 



266. Irradiation. (Helmholtz.) ........ 346 



267. Imperfect visual judgments of letters ...... 347 



268. Zollner's lines 347 



269. Imperfect visual judgment of size ....... 348 



270. Perception of size. (Helmholtz. ) 349 



271. Spiral disc for radial movement. (Helmholtz.) 350 



272. Kiihne's artificial eye, as made by Jung 351 



273. Apparatus to mix coloured light. (Bering.) ..... 352 



274. Scheme of 273. (Bering.) 3S 2 



275. Rothe's rotatory apparatus 353 



276. Disc for contrast. (Helmholtz.) 355 



277. Disc for simultaneous contrast. (Helmholtz.) 356 



278. Eagona Scina's experiment. (Rood.) 35^ 



279. Bering's apparatus for 278. (Bering.) 357 



280. Apparatus for simultaneous contrast. (Bering.) .... 357 



281. Simultaneous contrast apparatus. (Bering.) * * 357 



282. Bird and cage experiment 3 6z 



283. Spectrum top. (Hurst.) . ' 3^3 



284. Spectrum top with spiral. (Hurst.) 3 6 3 



285. Michel's carriage for rabbit. (Stirling.) 3^5 



286. Priestley Smith's demonstrating ophthalmoscope .... 366 



287. Aristotle's experiment 3^8 



288. Sherrington's drum as made by Palmer 3 8 5 



289. Birch's drum and recording apparatus. (Birch.) .... 386 



