Abstract
THE ordinary iris color in both the chicken and the domestic pigeon is rich orange. In connection with a genetical study of iris coloration of the pigeon, it was desired to compare the two species with regard to the pigments involved.Examination of the living eye with the dissection microscope reveals that the orange color in each is made up of two components: a tangle of red surface capillaries and a yellow background. Warren and Gordon (1933) found considerable non-inherited variability in redness of iris in the Rhode Island Red breed. Birds which have been killed, bled, and scalded show no redness in the iris, but only an amber yellow.The back of the iris is black; this pigmentation is a continuation of the retinal pigment layer. Warren (1933) has shown that albino chickens lack this black layer; however, the front of the iris contains the normal yellow pigment.The .
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