XVI LIST OF ILLUSTRATIONS. 



riG. FAOB 



24a View of larynx ..•••••••• 316 



241. Larynx during vocalisation 316 



242. Konig's apparatus 317 



243. Reaction time, pendulum method. {Butherford.) .... 324 



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



245. Reaction lime for touch, sight, hearing. {Butherford.) • . . 325 



246. Reaction time. {Stirling.) 326 



247. Neuramcebimeter. (Obersteiner.) 326 



248. Frog's brain. {Lavxdois and Stirling.) 327 



249. Scheiner's experiment 332 



250. Diffusion. {Hdmholtz.) 332 



251. Phakoscope . 334 



252. Model of plates of ophthalmometer. (Aubw,) 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. VoUanann's experiment on the blind spot 339 



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



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



260. Charpentier'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. (Hering.) .... 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. {HelvihoiUz.) 350 



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



273. Apparatus to mix coloured light. {Hering.) ..... 352 



274. Scheme of 273. {Hering. ) 352 



275. Rothe's rotatory apparatus 353 



276. Disc for contrast. (Helmholtz.) 355 



277. Disc for simultaneous contrast. {HelmJioltz.) 356 



278. Eagona Scina's experiment. (Bood.) 356 



279. Bering's apparatus for 278. {Hering.) ...... 357 



280. Apparatus for simultaneous contrast. {Hering.) .... 357 



281. Simultaneous contrast apparatus. {Hering.) . . • . .357 



282. Bird and cage experiment 3^' 



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



284. Spectrum top with spiral. {Hurst.) 3^3 



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



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



287. Aristotle's experiment 368 



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



289. Birch's drum and recording apparatus. {Birch.) • ... 386 



