(1) Further data on the crossing of albino ring doves with white ones are presented in this paper. (2) It is shown that the results of crossing experiments presented in this paper are all satisfactorily explained by the twofactor hypothesis brought forward by the writer (Tange, 1934). The blond color of plumage in the ring dove is developed by the combination of two factors : one being that which is responsible for the white plumage color and the dark eye color characteristic of the white ring dove, and the other being the intensity factor. The intensity factor can not develop coloration by itself, therefore it leaves the hird an albino with the snow-white plumage and the red eye. The two factors are the color factor C and the intensity factor I, the former being autosomal and the latter sex-linked as described in a paper published in 1934. (3) Albino ring doves, lacking both C and I factors and designated as ♀ = ccZiW and ♂ = ccZiZi have been bred by the present crossing experiments. They breed true and have established another kind of albino ring doves which the writer named " Albino II "
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