I N 1 9 5 6 , I P U B L I S H E D appeals for records of albinism and melanism in various journals, including British Birds (49; 512) and Bird Study ( 3 : 279). Similar requests for information -were broadcast on the radio on my behalf by Dr. Bruce Campbell and James Fisher. It was hoped to amass sufficient data to discover some of the causes of these phenomena and to ascertain their incidence amo...

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