An extraordinary case of colour blindness / by F.H. Perry-Coste.
- Perrycoste, Frank Hill
- Date:
- 1897
Licence: Public Domain Mark
Credit: An extraordinary case of colour blindness / by F.H. Perry-Coste. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![liand division of each column are given the reference-number and the true name of each colour; whilst in the right hand row of each column are given the names which he assigned—those colours being bracketed together that he considered to match. For several of the browns he was quite unable to suggest any names, and these are therefore marked “ unnamed.” At 12 o’clock. At 3 o’clock. By Gaslight. True Colour. Boy’s Names. True Colour. Boy’s Names. True Colour. Boy’s Names. I Prussian Blue Violet ... Prussian Blue Violet ... Prussian Blue 1 Violet 8 Indigo Blue Indigo 1 Blue ... Indigo f Blue Litmus Blue Blue Litmus f Blue Litmus Blue 12 Van.-Brown Unnamed Van. Brown Unnamed Van.-Brown “ Looks like a dirty yel- lowish ” 6 Bl’kish brown Unnamed Bl’kish Brown Unnamed Bl’kish Brown IO R’d’ish brown Unnamed R’d’ish Brown i Red ... R’d’ish Brown 5 Terra-cotta... ] Red;join- ( ed after Terra-cotta ... ( Terra-cotta... ► Red ( great he- 9 Vermilion ... ) sitation Vermilion ... Brown... Vermilion ... 17 Brill. Green... 3 Crimson Red Crimson Scarlet ... Crimson 13 Pink Litmus Red Pink Litmus Red Pink Litmus Pink 2 Gam. Yellow Yellow ... Gam. Yellow -v Gam. Yellow | Yellow i5 Turin. Yellow Yellow ... Turm. Yellow Turm. Yellow 7 Must. Yellow ) Must. Yellow ^Yellow Must. Yellow ) ii Nearly same > Green... Nearly same Nearly same > Yellow 4 Green s Green. - Green ) 16 Pale Green... White ... Pale Green ... White ... Pale Green ... White 17 Brill. Green... Green ... Brill. Green... Green (without hesitation) Let us now look a little more closely into the results exhibited by this table. We may fairly neglect those tabulated in the third column, since it is clear that the artificial light greatly lessened the boy’s power of discrimination—noting, however, the remarkable](https://iiif.wellcomecollection.org/image/b22333745_0008.jp2/full/800%2C/0/default.jpg)
