Letter | Published:

Photo-labile Pigments of the Chicken Retina

Nature volume 140, pages 545546 (25 September 1937) | Download Citation

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Abstract

THOUGH visual purples of the retinal rods have been known for sixty years1,2, nothing has been learned directly of analogous substances in the cones. In the chicken retina, which contains principally cones, attempts to identify photo-labile pigments heretofore have failed2. I have extracted from it two such pigments.

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Affiliations

  1. Biological Laboratories, Harvard University, Cambridge, Massachusetts. Aug. 19.

    • GEORGE WALD

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https://doi.org/10.1038/140545a0

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