EFFECTS OF LIGATING TESTES OF HEN-FEATHERED COCKS. 255 



a testis appeared almost normal in size. The comb measured 

 one and a half inches high, and two and three quarters inches 

 long. It is evident that the failure to change over except to a 

 very small extent was due to the failure of the operation. 



The fourth bird, No. 62, was a yellow, back-cross, single comb, 

 hen-feathered cock, Fig. 9. Its testes were ligated on July 10, 



FIG. 10. Same as Fig. 9, November 15. 



1919. He showed at first some effect of the operation, but his 

 comb soon began to enlarge again. On November 15, he was 

 still hen-feathered (Fig. 10). A comparison of the feathers of 

 July 10 with those of November 15, Fig. n, a, a 1 , b, b 1 , etc., 

 shows little change. When opened at this date no trace of the 

 testis was found on the left side. On the right side a large piece 

 of testis-like tissue was present in a sheath tightly adherent to 

 the body wall. It was opened and some very loose tissue (?) 

 taken out. This was preserved for examination and the bird 

 was closed up. It was kept alive until March 15. Its feathers 

 at this time are shown in Fig. u, a 2 , b 2 , c 1 , d 2 . The comb was 

 large and the bird appeared to be nearly hen-feathered. It was 

 killed and examined. On the left side there were two small 

 pieces of testis which together were no larger than a pea. On 



