[cameronJ 



EFFECT ON RATS OF THYROID FEEDING 



63 



Total Growth 



The results tabulated in Table I show in every case in experi- 

 ments 1 to 5 a decrease in growth-rate of thyroid-fed animals during 

 the period of thyroid-feeding. In most cases the decrease is marked. 

 This is in complete agreement with our previous observations (2, 3, 

 4, 6). In the subsequent period the thyroid fed animals had a faster 

 growth-rate in 13 cases out of 17. Of the 4 exceptions one (experi- 

 ment 1, male) was approximately equal to the control, one (experi- 

 ment 2, 2nd male) was obviously abnormal, and the remaining 2 

 (experiment 5, females) were intermediate between the 2 controls. 



liC. 



140 



10Û 



bO- 



20 





TOO 



60 



20 



R.^: 



Rat 1 



Experiment 1 

 Males 



30 



5Ô" 



90 



Experiment i 

 Females 



30 



60 



G3 

 IÔO 



UO 



too- 



60^ 



20J 



Rat 7 

 Rf:t 3 



100 • 



60 



"50 D«ys ^ 



50 



30 



Fig. I 



.-''•Rat 3 

 1 



Rat I 



Experiment I. 

 Males. 



/*^\,.^^Ral ♦ 



eo 



90 Days 



Rat 6 

 Rat 5 



Experiment 2. 

 Faiii4l.«s 



60 



90 D&;e 



