COMPENSATORY HYPERTROPHY OF THE TESTES. 



465 



TABLE III. 



RESULTS OF UNILATERAL CASTRATION AT 24 WEEKS. 



All weights are in grammes. Per cent, weight = percentage of weight of testis 

 to total weight of bird. 



1 c = control. 



2 No. 808 was ill during the first half of the experimental period and lost con- 

 siderable weight which it had not regained at the time the bird was killed and the 

 surviving testis removed. 



pairs, while the right surviving testis is not as heavy as control 

 single testes. After twenty-four weeks there was no hypertrophy 

 at all to be observed in the left surviving testis; as this bird 

 had been in poor condition and lost considerable weight during 

 the experimental period, we do not attach much significance to 



