300 



The Journal of Heredity 



January 24, 1921 



Scptembei- 15, 1921 



April 12, 1922 



October 22, 1922 



CHANGING FROM BLACK TO WHITE 



Figure 3. The first unusual thing noticed about this hen was that she began to take 

 on cock-like characteristics. The large comb is the most noticeable of them. She also 

 began to crow. Then, e.very time she moulted some of her black feathers were replaced 

 by lighter colored ones, and in less than twenty-one months she had become almost entirely 

 white. Her adrenal glands were found to be atrophied, and it is possible that the changes 

 in metabolism brought about by a lack of their secretions resulted in this change, of 

 color. In humans the rare and fatal "Addison's disease" is always accompanied by a 

 diseased condition of the adrenals, and by a peculiar pigmentation of the skin. 



