Relation between the Thymus and the Generative Organs. 77 



Experiment 7 (fig. 3) : Effect of the Simultaneous Removal of the Testes anal 

 Thymus on the Growth of the Animal. — This experiment was undertaken to 

 investigate the effect of castration and thymectomy together on growth. In 

 order to annul the operative effect the controls were vasectomised and 

 pseudo-thymectomised. The experiment commenced with 9 animals, 

 4 operated, 5 controls, on July 16, and with 16 others (8 a side) on July 25. 

 Eeference to the protocol will show that this double operation has no 

 effect upon the growth of guinea-pigs, a result directly contrary to that of 

 Noel Paton. 



Set 1. 













Weight after — 





























Animal No. 



Weight, 





















July 16. 



9 



37 



75 



86 



101 



125 



150 



177 







days. 



days. 



days. 



days. 



days. 



days. 



days. 



days. 









Control Animals. 













grm. 



grm. 



grm. 



grm. 



grm. 



grm. 



grm. 



grm. 



grm. 



1 



180 



210 



306 



342 



338 



357 



437 



542 



607 



2 



178 



202 



270 



290 



265 



292 



328 



433 



460 



3 



185 



216 



300 



372 



370 



402 



442 



543 



582 



4 



192 



220 



301 



340 



340 



347 



397 



489 



509 



5 



105 



139 



237 



286 



285 



317 



383 



455 



485 





168 



197 



283 



326 



319 



343 



397 



492 



528 







Operated Animals. 











1 



186 



215 



280 



335 



344 



360 



375 



445 



472 



2 



195 



221 



285 



331 



320 



345 



387 



474 



502 



3 



160 



191 



282 



318 



319 



322 



367 



445 



492 



4 



197 



223 



311 



343 



354 



345 



370 



480 



465 



Average 



184 



212 



289 



332 



334 



343 



375 



461 



483 



