LIST OF ILLUSTRATIONS. 



xxin 



1099, 

 imination in retina 

 of colour vision 



FIG. 



386. Experiment to test Talbot-Plateau law (Helmholtz) 

 387, 388. „ upon the influence of contrast on flicker sensation 



(Sherrington) ....... 1070, 



389. Fechner's experiment 



390. Experiments on flicker (Haycraft) 



391. Colour triangle .... 



392. Curve of luminosity in total colour-blindness (Konig) 



393. 394. Entoptic appearances . 



395. Helmholtz's experiment on delicacy of local discr 



396. Curves illustrating the Young-Helmholtz theory 



(Konig and Dieterici) ..... 



397. Curves of sensation in red-green blindness (Konig and Dieterici) 



398. Curve of spectral and fundamental colours 



399. „ „ „ „ (Helmholtz) 



400. Experiment on single and double vision (Volkmann) 



401. „ „ ,, ,, (Wheatstone) . 

 402-404. Form of horopter (Hildebrand) . . . .1127, 

 405, 406. To illustrate Listing's law (Hering) . 

 407. Apparatus for investigating visual localisation (Greeff) 

 408-410. To illustrate geometrical illusions .... 1141, 



411. Diagram to explain geometrical illusions (Kundt) 



412. „ „ „ „ (Hering) 



413. Lipp's experiment on geometrical illusions 



414. Auerbach's experiment ..... 



415. 416. To illustrate Einthoven's explanation of colour stereoscopy 



417. Spiral disc illusion ..... 



418. Posterior wall of the cartilaginous and osseous meatus (Politzer) 



419. Curvature of tympanic membrane (Helmholtz) . 



420. Illustrates the effect of the curve of the radial fibres of the membrana 



tympani ....... 



421. Relations of the malleus and incus (Helmholtz) . 



422. Ear manometer (Politzer) ..... 



423. Various forms of wave curves .... 



424. Form of wave produced by combining two simple waves. 



425. Compound wave form according to Max Meyer . 



426. Diagram showing range of registers of human voice 



427. Aperture of glottis during production of low note or lower register 



(Bos worth) .... 



428. Aperture of glottis during production of high note of lower register 



(Bosworth) .... 



429. Aperture of glottis during production of a note in the head register 



(Bosworth) .... 



430. Pitch of vowels according to Helmholtz . 



431. „ „ „ ,, Konig 



432. Konig's apparatus for illustrating the quality of vowel tones by a 



manometric flame .... 



433. Flame pictures of the vowels U, 0, and A (Konig) 



434. Diagram showing the first step in analysing wave-forms . 



435. Diagram showing tbe amplitude as indicated by the height of ordinates 



of the partials of the Swedish i, sung at pitch of 293 vibs. (Pipping) 



436. Diagram showing the amplitude in the partials of the German long a 



sung and analysed by Hermann ..... 



437. Diagram showing the application of Pipping's method . 



438. Examples of vowel curves obtained by Hermann . 



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