MONOCHROMATIC VISION 191 



attention to the similarity of the scotopic luminosity curve and the curve 

 of bleaching values for different monochromatic lights for the visual 

 purple (p. 55). 



T. C. Porter's and Schaternikoff's experiments, especially the 

 latter, (p. 95), have shown that the rate of change of fusion frequency 

 of intermittent stimulation of the retina is lower for achromatic 

 scotopic than for photopic vision. Uhthoff l examined one of his cases 

 and found that the totally colour-blind reacts like the normal with 

 achromatic scotopic vision. A rotating disc with black and white sectors 

 ceases to flicker with an intensity of light even above the normal 

 photopic threshold whilst it is still flickering to the normal eye. Nagel 

 has confirmed this observation. 



The facts of monochromatic vision are inconsistent with the view 

 that it is a simple reduction form of trichromatic vision, though 

 some cases have been regarded as of this nature. The theoretical 

 explanation will be discussed in Part III, Section I. 



BIBLIOGRAPHY OF CASES OF MONOCHROMATIC VISION 



Huddart. Phil. Trans. Roy. Soc. Lond. LXVH. 260, 1777. 



Schopenhauer (1812). Griesebachsche Ausgabe, vi. 81, 1875. 



Rosier. Obs. sur la physique, etc. xm. 87, 1779. 



d'Hombres-Firrnas. C. r. acad. des sci. n. 1849. 



Rose. Arch. f. Oplitli. xn. 2, 98, 1860. 



Galezowski. Du diagnostic des maladies des yeux par la chromatoscopie retinienne, Paris, 

 1868. 



Bonders. Klin. Monatsbl. f. Augenhlk. 470, 1871. 



Raehlmann. Arch. f. Ophth. xxn. 29, 1879 ; Ztsch. f. Augenhlk. n. 315, 403, 1900. 



Cohn. Studien uber angeb. Farbenblindheit, Breslau, 1879. 



Becker. Arch. f. Ophth. xxv. 2, 205, 1879. 



Nettleship. St Thomas's Hosp. Rep. x. 37, 1880 ; Roy. Lond. Hosp. Ophth. Rep. xi. 

 373, 1887. 



Magnus. Centralbl. f. Augenhlk. iv. 373, 1881. 



Landolt. Arch. d'Opht. i. 114, 1881 ; xi. 202, 1891. 



Scholer and Uhthoff. Bcitrdge. z. Path. d. Sehnerven, Berlin, 1884. 



Dor. Rev. gen. d'Opht. iv. 434, 1885. 



Konig and Dieterici. Sitz. d. Akad. d. Wiss. Berlin, 805, 1886; Uhthoff, Arch. f. 

 Ophth. xxxn. 1, 200, 1886 : Konig, Arch. f. P*ychiat. und Nervenkr. xxi. 284, 1889 ; in 

 Konig, p. 206. 



Kressig. Mitt. a. d. ophth. Klinik zu Tubingen, n. 332, 1890. 



Querenghi. Ann. di Ottal. 35, 1891 ; Ann. d'ocul. cvi. 333, 1891. 



Hering. Arch. f. d. ges. Physiol. XLIX. 563, 1891. 



v. Kries. Ztsch. f. Psychol. u. Physiol. d. Sinnesorg. xm. 241, 1897. 



Colburn. Amer. J. of Ophth. xiv. 237, 1897. 



1 v. Kries, Zlsch. f. Psychol. u. Physiol. d. Sinnesorg. xxxn. 113, 1903. 



