COMPENSATORY HYPERTROPHY OF THE TESTES. 



467 



I la. SUMMARY OF RESULTS OF UNILATERAL CASTRATION 



AT VARIOUS AGES. 



The preceding tables and descriptions demonstrate that re- 

 moval of one of the testes pair induces an increase in size of the 

 retained partner when the retention period is of sufficient length, 

 with the exception of the right isolated testes of young chicks 

 (Table I.)- 



When unilateral castration is performed on young cockerels 

 the left surviving gonad hypertrophies to a greater degree than 

 does the right one, the one differing result obtained in No. 808 

 being due to the bird's general condition. 



The increase in weight of the isolated testis becomes manifest 

 only after a certain interval following castration, the interval 

 being apparently somewhat longer for the right hypertrophying 

 testis than for the left one when younger birds are operated upon. 



TABLE V. 



DATA COMPILED FROM TABLES I. -IV. CONTROL TESTES WEIGHTS 



STATED AS AVERAGES. 



All weights are in grammes. 



