‘¢ HCLIPSE” PLUMAGE IN THE MALLARD, 35 
Text-figure 3. 
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Mallard (13), photographed in July 1907; in almost full winter plumage. 
The bird was castrated in December 1906. The eclipse has been delayed. 
Text-figure 4, 
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The same Mallard as shown in text-fig. 3: photographed September 11th, 1907. 
The bird was castrated in December 1906. The advent of the eclipse in the summer 
of 1907 was delayed. The plumage is now largely of the eclipse kind; the 
bird was not fully out of eclipse in January 1908, before which time it should 
normaily have been in complete winter dress. 
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