Relation between the Thymus and the Generative Organs. 83 



Experiments 12 to 17 : Effect of the Removal of the Thymus on the Weight 

 of the Testes. — In these experiments, the chief intention was to investigate the 

 effect of thymectomy on the weight of the testes. In order to cut out the 

 enormous variation in the weight of the testes obtained as the animal 

 approaches puberty all animals were killed when they attained the weight of 

 about 260 grm. 



Eeference to fig. 5, on which the results obtained from this and other experi- 

 ments are plotted, shows that thymectomy does not lead to a compensating 

 acceleration in the growth of the testes. 





Animals used. 



Initial average weight in grammes. 













Experiment. 













Normals. 



Operated. 



Normals. 



Operated. 



12 



8 



6 



188 



166 



13 





5 





164 



14 



7 





185 



191 



15 



6 



5 



139 



145 



16 



9 



7 



166 



187 



17 





4 





174 



Experiment 12. 



Initial weight. 



Pinal 

 weight. 



Weight of 

 testes. 



Initial 

 weight. 



Final 

 weight. 



Weight of 

 testes. 



Control Animals. 





Operated Animals. 



grm. 



grm. 



grm. 



grm. 



grm. 



grm. 



187 



277 



0-620 



153 



257 



0-550 



222 



270 



0-720 



207 



268 



0-590 



170 



254 



0-465 



174 



275 



0-795 



175 



254 



0-514 



138 



266 



550 



187 



255 



0-456 



162 



255 



0-460 



202 



267 



0-603 



162 



257 



0-655 



200 



267 



0-590 









163 



260 



0-795 











263 



0-598 



166 



263 



0-600 



