466 



L. V. DOMM AND MARY JUHN. 



this case. The right surviving testis is probably to be regarded 

 as hypertrophied, being heavier than one of the control pairs and 

 its percentage weight greater than any one testis of the other 

 control pair. 



In the group where the cocks were mature (Table IV.), there 

 was not so much difference to be observed in the hypertrophy 

 of the surviving testes. The left testis had increased relatively 

 more in size compared with the gland removed at the operation 

 than the right testis. The hypertrophying testes were retained 



TABLE IV. 



RESULTS OF UNILATERAL CASTRATION AT 32-40 WEEKS. 



All weights are in grammes, 

 to total weight of bird. 

 1 c = control. 



Per cent, weight = percentage of weight of testis 



for only eight weeks, the observation period being planned to 

 extend only to forty-eight weeks of age. The left surviving 

 testis was larger than any single testis of the two control pairs, 

 but not as heavy as either pair together. The right surviving 

 testis was heavier than one control pair and almost equal to 

 the other pair, being 0.86 per cent, of the body weight while the 

 two control testes pairs weighed 0.78 per cent, and 0.97 per cent, 

 respectively. While the cases are few, the evidence seems to 

 indicate compensatory hypertrophy in this group also after a 

 very short period. 



