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T. H. MORGAN. 



what like a Sebright, but the yellow centers of the feathers were 

 much mottled making the general effect of the plumage darker 

 than that of the Sebright. Ligatures were put around the testes 

 on July 10, 1919, but unfortunately one of them did not com- 

 pletely encircle the end of one testis, so that a piece was con- 



FIG. 9. Hen-feathered, back-cross, single comb, No. 62. 



stricted off. This piece was left in position at the time. The 

 feathers that came in (Sept.) underwent very little change, the 

 centers becoming somewhat clearer, Fig. 7, a 1 -^ 1 . The presence 

 of a large comb made it certain that a considerable amount of the 

 testes had remained active. On opening the bird (Nov. 15), no 

 pieces of the left testis were found. On the right side there was 

 a testis highly vascularized, attached to the body wall. It was 

 removed and after the operation the comb became smaller; but 

 after a while began to grow, until by March 8, it was quite large 

 again. The bird might still be said to be almost completely hen- 

 feathered (Fig. 8). It was killed and opened on March 17, 1920. 

 On the left side was found a large, detached piece, berry-like in 

 appearance, undoubtedly a regenerated testis. On the right side 



