On colour-sight and colour-blindness : in its relation to railway and sea signals : read before the Glasgow Philosophical Society, on March 5, 1879 / by J.R. Wolfe.

Date:
1879
Catalogue details

Licence: Public Domain Mark

Credit: On colour-sight and colour-blindness : in its relation to railway and sea signals : read before the Glasgow Philosophical Society, on March 5, 1879 / by J.R. Wolfe. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    For chemical tests he has to rely entirely upon other parties. His grandfather and maternal uncle were colour-blind. Case III. Dr. Cumming introduced Mr. B., a merchant in town, who is remarkably clever in the appreciation of designs; in the blending of colours he generally succeeds fairly, but sometimes he makes ridiculous mistakes. In his case— Pale Green is Shetland Grey; Bright Green Drab, or Fawn; Dark Green Purple; Crimson....] Scarlet ....I Doubtful Red; Orange .... Light and Dark Green Drab; Salmon s Lemon , Yellow; Yellow ) Blue Correct; Violet Blue; Purple Indigo. The difference between certain shades of fawn, green, and red, is to him no contrast at all, but he seems to know them, in his warehouse, in a kind of catalogue way. Therefore, he is totally green-blind and deficient in red: for instance, a piece of scarlet cloth thrown upon a bright green ground is not readily picked up. He is hypermetropic (H 14 left, and 10 right); hearing of left ear is rather deficient. There is also an eye-history in his family.