76 



Mr. Hainan and Dr. Marshall. 



Animal No. 



W eignt, 



Weight 



Weight 



W eignt 



W eignt 





duly 1. 



after 24 days. 



when killed. 



of testes. 



of thymus. 







Control Animals. 









grm. 



grm. 



grm. 



grm. 



grm. 



1 



133 



187 



200 



0-320 



0-277 



2 



213 



317 



322 



1 -250 



-410 



3 



201 



267 



272 



1-120 



0-322 



A 

 *± 



1 fill 



245 



252 



U O/O 



"350 



5 



136 



193 



207 



0-320 



0-320 



6 



171 



245 



235 



0-620 



0-408 



7 



226 



316 



340 



1 -125 



0-480 



8 



170 



268 



307 



0-970 



0-506 



9 



166 



252 



240 



0-633 



-460 





174 



254 



264 



0-781 



0-392 





Thymectomised Animals. 







1 



233 



347 



352 



1 -43 





2 



156 



219 



221 



0-454 





3 



238 



358 



380 



1 -800 





4 



168 



226 



212 



0-425 





5 



167 



215 



235 



0-580 





6 



201 



260 



245 



0-930 





7 



163 



233 



215 



-620 





,.t8„ . 



205 



296 



300 



1 -170 





9 



157 



238 



'258 



-623 





10 



197 



301 



310 



1 -450 





11 



225 



316 



364 



1-702 





12 



205 



256 



237 



-835 





13 



152 



230 



265 



0-640 





14 



158 



234 



257 



0-630 





Average 



187 



266 



275 



0-949 





Fig. 2. — Effect of the Eemoval of the Thymus on the Growth of Guinea-pigs. 



(The squares represent the averages of Experiment 5, the triangles Experiment 6, and the 

 circles Experiment 2. In all cases the blacked figures represent the operated animals.) 



