Relation between the Thymus and the Generative Organs. 81 



Experiment 10: .Effects of the Removal of the Ovaries on the Weight of the 

 Thymus. — Five females were castrated August 11-14, and compared with 

 6 controls. The experiment extended from August 11 to October 9. 

 Eeference to the data given will show that castration in th& female, as in 

 the male, leads to an arrested atrophy and continued growth of the thymus 

 gland. 



Animal No. 



Weight, 



Weight after 



Weight of 





August 11. 



59 days. 



thymus. 





Control Animals. 







grm. 



grm. 



grm. 



1 



182 



334 



0-305 



2 



170 



246 



0-190 



3 



160 



326 



0-363 



4 



177 



320 



-280 



5 



158 



365 



-400 



6 



181 



350 



0-320 



Average 



171 



323 



0-309 





Operated Animals. 





1 



162 



424 



0-805 



2 



160 



326 



0-405 



3 



153 



406 



0-720 



4 



170 



415 



0-780 



5 



145 



341 



0-590 





158 



382 



0-660 



Experiment 11 (fig. 5) : Effect of Removal of the Thymus on the Weight of fh e 

 Testes and on the Growth of the Animal. — Nine animals thymectomised 

 October 21, 9 controls. The experiment extended from October 21 to 

 November 18, by which time 6 operated animals and 7 normal animals were 

 over 300 grm. in weight. The evidence here confirms the findings of 

 Experiments 2, 5 and 6. 



VOL. LXXXVJII. — B. 



