80 



Mr. Hainan and Dr. Marshall. 



Experiment 9 (fig. 4): Effect of Semi-Castration on the Weight of the Thymus. — 

 In this set 7 animals were semi-castrated. The results, in so far as these 

 related to the thymus weights, were too variable to admit of any importance 

 being attached to them. 



Animal No. 



Weight, 



A ll oni of*. 1 3 



Weight after 



£11 rlnvc: 



Weight of 

 remaining 

 testis. 



Weight of 



til* IlX U.5. 





grm. 



grm. 



grm. 



grm. 



1 



117 



310 



0-652 



0-355 



2 



134 



358 



1-214 



0-480 



3 



136 



350 



1 -048 



0-380 



4 



117 



363 



1 -206 



0-550 



5 



154 



362 



1-312 



0-385 



6 



]23 



368 



1 -100 



0-546 



7 



148 



356 



1-400 



0-252 



Average 



133 



352 





0-421 



•7 — — -7 



• O • 



o 



250 300 .-^n 400 450 500 



Fig. 4. — Effect of Kemoval of Testis on the Weight of the Thymus. 



(Blacked circles, castrated animals ; semi-blacked circles, semi-castrated animals ; clear 

 circles, control animals. Vertical, weight of thymus in grammes ; horizontal, body 

 weight in grammes.) 



