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  1. To appear in a later number of this Joural.
  2. See, for example, C. v. HessBeiträge zur Kenntnis des Lichtsinnes bei Wirbellosen. Arch. f. d. ges. Physiol.,  177, 57–109; 1920.
    [Crossref]
  3. See, for example, F. SchnurmannUntersuchungen an Elritzen über Farben-wechsel und Lichtsinn der Fische. Zeitsch. f. Biol.,  71, 69–98; 1920.
  4. See C. v. HessDie Rotgrünblindheiten. Arch. f. d. ges. Physiol.,  185, 147–164, 1920.
    [Crossref]
  5. Ferree and Rand find that red, yellow and blue, but not green, can be perceived as chromatic at the extreme periphery with a sufficient intensity of light. See C. E. Ferree and G. RandThe Absolute Limit of Color Sensitivity and the Effect of Intensity of Light on the Apparent Limit. Psychol. Rev.,  27, 1–123; 1920.
    [Crossref]
  6. See J. H. ParsonsAn Introduction to the Study of Color Vision, p. 71, 1915.
  7. The proposition that the acuity index depends upon the brightness value of a stimulus, independently of its color, was clearly enunciated by Helmholtz in several places, and had been assumed by previous workers such as Macé de Lapinay and Nicati who employed equality of acuity as a criterion of equality of brightness. Repeated attempts have been made to employ an acuity test as a basis for heterochromatic photometry. König regarded his very systematic work on this subject as clearly substantiating Helmholtz’s original conjecture. See König, A. Die Abhangigkeit der Sehscharfe von der Beleutungsintensität, Gesammelte Abhandlungen zur Physiologischen Optik. 1903, p. 391. However, the problem is much complicated by uncertainty in the conditions or method of observation; the proportions of rod and cone vision involved, the exact visibility curves of the observers, and the exact importance of the purely physical chromatic aberration effects within the eye. Dr. Ferree finds a very considerable dependence of acuity upon chroma even when rod vision is excluded. Whether his results, in common with those of Luckiesh, can be explained in terms of the refractive properties of the eye or whether they will require a retinal basis is at present uncertain.
  8. M. LuckieshColor and Its Applications, pp. 130–137, 1915.
  9. J. H. Parsons, op. cit., p. 96.
  10. H. E. IvesStudies in the Photometry of Lights of Different Colors. II. Spectral Luminosity Curves by the Method of Critical Flicker Frequency. Phil. Mag.,  24, p. 357–362, 1912.
  11. W. McDougallThe Variation of the Intensity of Visual Sensation with the Duration of the Stimulus. British Jour. of Psychol.,  1, p. 189, 1904.
  12. See P. G. NuttingThe Luminous Equivalent of Radiation. Bull. of the Bur. of Stands.,  5, p. 293, 1908.
  13. M. A. BillsThe Lag of Visual Sensation and Its Relation to Wave-Length and Intensity of Light. Psychological Review Monographs, 28, No. 5.
  14. See P. G. Nuttingloc. cit., p. 286.
  15. H. E. IvesStudies in the Photometry of Lights of Different Colors. IV. The Addition of Luminosity to Different Colors. Phil. Mag. 24, pp. 845–853, 1912.
    [Crossref]
  16. L. T. TrolandApparent Brightness; Its Conditions and Properties. Trans. of the Illum. Eng. Soc. 5, p. 954; 1916.
  17. For expositions of these two theories see J. H. Parsons, op. cit., Part III.
  18. See W. de W. AbneyResearches in Color Vision and the Trichromatic Theory, 1913.
  19. See L. T. Trolandloc. cit., p. 955–957.
  20. W. de W. Abneyop. cit., pp. 371–380.
  21. As yet unpublished.
  22. L. T. TrolandPreliminary Note; The Influence of Changes of Illumination upon After-Images. Amer. Jour. of Psychol.,  28, pp. 497–503; 1917.
  23. In the Young-Helmholtz Theory, as interpreted by the majority of its exponents, this uniqueness of the red would probably consist in its being the only chromatic process which is capable of being excited in isolation from others.
  24. Cf. J. H. Parsons, op. cit., p. 270.
  25. H. K. SchjelderupZur Theorie der Farbenempfindungen. Zeits. für Sinnesphysiol. 51, 19–45; 1920.

1920 (5)

See, for example, C. v. HessBeiträge zur Kenntnis des Lichtsinnes bei Wirbellosen. Arch. f. d. ges. Physiol.,  177, 57–109; 1920.
[Crossref]

See, for example, F. SchnurmannUntersuchungen an Elritzen über Farben-wechsel und Lichtsinn der Fische. Zeitsch. f. Biol.,  71, 69–98; 1920.

See C. v. HessDie Rotgrünblindheiten. Arch. f. d. ges. Physiol.,  185, 147–164, 1920.
[Crossref]

Ferree and Rand find that red, yellow and blue, but not green, can be perceived as chromatic at the extreme periphery with a sufficient intensity of light. See C. E. Ferree and G. RandThe Absolute Limit of Color Sensitivity and the Effect of Intensity of Light on the Apparent Limit. Psychol. Rev.,  27, 1–123; 1920.
[Crossref]

H. K. SchjelderupZur Theorie der Farbenempfindungen. Zeits. für Sinnesphysiol. 51, 19–45; 1920.

1917 (1)

L. T. TrolandPreliminary Note; The Influence of Changes of Illumination upon After-Images. Amer. Jour. of Psychol.,  28, pp. 497–503; 1917.

1916 (1)

L. T. TrolandApparent Brightness; Its Conditions and Properties. Trans. of the Illum. Eng. Soc. 5, p. 954; 1916.

1915 (2)

See J. H. ParsonsAn Introduction to the Study of Color Vision, p. 71, 1915.

M. LuckieshColor and Its Applications, pp. 130–137, 1915.

1913 (1)

See W. de W. AbneyResearches in Color Vision and the Trichromatic Theory, 1913.

1912 (2)

H. E. IvesStudies in the Photometry of Lights of Different Colors. IV. The Addition of Luminosity to Different Colors. Phil. Mag. 24, pp. 845–853, 1912.
[Crossref]

H. E. IvesStudies in the Photometry of Lights of Different Colors. II. Spectral Luminosity Curves by the Method of Critical Flicker Frequency. Phil. Mag.,  24, p. 357–362, 1912.

1908 (1)

See P. G. NuttingThe Luminous Equivalent of Radiation. Bull. of the Bur. of Stands.,  5, p. 293, 1908.

1904 (1)

W. McDougallThe Variation of the Intensity of Visual Sensation with the Duration of the Stimulus. British Jour. of Psychol.,  1, p. 189, 1904.

Abney, W. de W.

See W. de W. AbneyResearches in Color Vision and the Trichromatic Theory, 1913.

W. de W. Abneyop. cit., pp. 371–380.

Bills, M. A.

M. A. BillsThe Lag of Visual Sensation and Its Relation to Wave-Length and Intensity of Light. Psychological Review Monographs, 28, No. 5.

Ferree, C. E.

Ferree and Rand find that red, yellow and blue, but not green, can be perceived as chromatic at the extreme periphery with a sufficient intensity of light. See C. E. Ferree and G. RandThe Absolute Limit of Color Sensitivity and the Effect of Intensity of Light on the Apparent Limit. Psychol. Rev.,  27, 1–123; 1920.
[Crossref]

Hess, C. v.

See, for example, C. v. HessBeiträge zur Kenntnis des Lichtsinnes bei Wirbellosen. Arch. f. d. ges. Physiol.,  177, 57–109; 1920.
[Crossref]

See C. v. HessDie Rotgrünblindheiten. Arch. f. d. ges. Physiol.,  185, 147–164, 1920.
[Crossref]

Ives, H. E.

H. E. IvesStudies in the Photometry of Lights of Different Colors. II. Spectral Luminosity Curves by the Method of Critical Flicker Frequency. Phil. Mag.,  24, p. 357–362, 1912.

H. E. IvesStudies in the Photometry of Lights of Different Colors. IV. The Addition of Luminosity to Different Colors. Phil. Mag. 24, pp. 845–853, 1912.
[Crossref]

Luckiesh, M.

M. LuckieshColor and Its Applications, pp. 130–137, 1915.

McDougall, W.

W. McDougallThe Variation of the Intensity of Visual Sensation with the Duration of the Stimulus. British Jour. of Psychol.,  1, p. 189, 1904.

Nutting, P. G.

See P. G. NuttingThe Luminous Equivalent of Radiation. Bull. of the Bur. of Stands.,  5, p. 293, 1908.

See P. G. Nuttingloc. cit., p. 286.

Parsons, J. H.

See J. H. ParsonsAn Introduction to the Study of Color Vision, p. 71, 1915.

J. H. Parsons, op. cit., p. 96.

Cf. J. H. Parsons, op. cit., p. 270.

For expositions of these two theories see J. H. Parsons, op. cit., Part III.

Rand, G.

Ferree and Rand find that red, yellow and blue, but not green, can be perceived as chromatic at the extreme periphery with a sufficient intensity of light. See C. E. Ferree and G. RandThe Absolute Limit of Color Sensitivity and the Effect of Intensity of Light on the Apparent Limit. Psychol. Rev.,  27, 1–123; 1920.
[Crossref]

Schjelderup, H. K.

H. K. SchjelderupZur Theorie der Farbenempfindungen. Zeits. für Sinnesphysiol. 51, 19–45; 1920.

Schnurmann, F.

See, for example, F. SchnurmannUntersuchungen an Elritzen über Farben-wechsel und Lichtsinn der Fische. Zeitsch. f. Biol.,  71, 69–98; 1920.

Troland, L. T.

L. T. TrolandPreliminary Note; The Influence of Changes of Illumination upon After-Images. Amer. Jour. of Psychol.,  28, pp. 497–503; 1917.

L. T. TrolandApparent Brightness; Its Conditions and Properties. Trans. of the Illum. Eng. Soc. 5, p. 954; 1916.

See L. T. Trolandloc. cit., p. 955–957.

Amer. Jour. of Psychol. (1)

L. T. TrolandPreliminary Note; The Influence of Changes of Illumination upon After-Images. Amer. Jour. of Psychol.,  28, pp. 497–503; 1917.

An Introduction to the Study of Color Vision (1)

See J. H. ParsonsAn Introduction to the Study of Color Vision, p. 71, 1915.

Arch. f. d. ges. Physiol. (2)

See, for example, C. v. HessBeiträge zur Kenntnis des Lichtsinnes bei Wirbellosen. Arch. f. d. ges. Physiol.,  177, 57–109; 1920.
[Crossref]

See C. v. HessDie Rotgrünblindheiten. Arch. f. d. ges. Physiol.,  185, 147–164, 1920.
[Crossref]

British Jour. of Psychol. (1)

W. McDougallThe Variation of the Intensity of Visual Sensation with the Duration of the Stimulus. British Jour. of Psychol.,  1, p. 189, 1904.

Bull. of the Bur. of Stands. (1)

See P. G. NuttingThe Luminous Equivalent of Radiation. Bull. of the Bur. of Stands.,  5, p. 293, 1908.

Color and Its Applications (1)

M. LuckieshColor and Its Applications, pp. 130–137, 1915.

Phil. Mag. (2)

H. E. IvesStudies in the Photometry of Lights of Different Colors. II. Spectral Luminosity Curves by the Method of Critical Flicker Frequency. Phil. Mag.,  24, p. 357–362, 1912.

H. E. IvesStudies in the Photometry of Lights of Different Colors. IV. The Addition of Luminosity to Different Colors. Phil. Mag. 24, pp. 845–853, 1912.
[Crossref]

Psychol. Rev. (1)

Ferree and Rand find that red, yellow and blue, but not green, can be perceived as chromatic at the extreme periphery with a sufficient intensity of light. See C. E. Ferree and G. RandThe Absolute Limit of Color Sensitivity and the Effect of Intensity of Light on the Apparent Limit. Psychol. Rev.,  27, 1–123; 1920.
[Crossref]

Researches in Color Vision and the Trichromatic Theory (1)

See W. de W. AbneyResearches in Color Vision and the Trichromatic Theory, 1913.

Trans. of the Illum. Eng. Soc. (1)

L. T. TrolandApparent Brightness; Its Conditions and Properties. Trans. of the Illum. Eng. Soc. 5, p. 954; 1916.

Zeits. für Sinnesphysiol. (1)

H. K. SchjelderupZur Theorie der Farbenempfindungen. Zeits. für Sinnesphysiol. 51, 19–45; 1920.

Zeitsch. f. Biol. (1)

See, for example, F. SchnurmannUntersuchungen an Elritzen über Farben-wechsel und Lichtsinn der Fische. Zeitsch. f. Biol.,  71, 69–98; 1920.

Other (11)

J. H. Parsons, op. cit., p. 96.

The proposition that the acuity index depends upon the brightness value of a stimulus, independently of its color, was clearly enunciated by Helmholtz in several places, and had been assumed by previous workers such as Macé de Lapinay and Nicati who employed equality of acuity as a criterion of equality of brightness. Repeated attempts have been made to employ an acuity test as a basis for heterochromatic photometry. König regarded his very systematic work on this subject as clearly substantiating Helmholtz’s original conjecture. See König, A. Die Abhangigkeit der Sehscharfe von der Beleutungsintensität, Gesammelte Abhandlungen zur Physiologischen Optik. 1903, p. 391. However, the problem is much complicated by uncertainty in the conditions or method of observation; the proportions of rod and cone vision involved, the exact visibility curves of the observers, and the exact importance of the purely physical chromatic aberration effects within the eye. Dr. Ferree finds a very considerable dependence of acuity upon chroma even when rod vision is excluded. Whether his results, in common with those of Luckiesh, can be explained in terms of the refractive properties of the eye or whether they will require a retinal basis is at present uncertain.

For expositions of these two theories see J. H. Parsons, op. cit., Part III.

To appear in a later number of this Joural.

M. A. BillsThe Lag of Visual Sensation and Its Relation to Wave-Length and Intensity of Light. Psychological Review Monographs, 28, No. 5.

See P. G. Nuttingloc. cit., p. 286.

In the Young-Helmholtz Theory, as interpreted by the majority of its exponents, this uniqueness of the red would probably consist in its being the only chromatic process which is capable of being excited in isolation from others.

Cf. J. H. Parsons, op. cit., p. 270.

See L. T. Trolandloc. cit., p. 955–957.

W. de W. Abneyop. cit., pp. 371–380.

As yet unpublished.

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