Hammett : The Thvroid Gland 



293 



100^ 



51^ 



v. 



'A 



CONTROL 



Testes 



\ Ovaries 



EFFECT OF THYROID GLAND ON GROWTH OF THE GONADS 



Figure 2. In these white rats the removal of the thyroid and para- 

 thyroid glands has resulted in the male gonads reaching only about half the 

 normal development, and in actual degeneration and atrophy of the female 

 reproductive organs. Goiter and other diseases of the thyroid are much 

 more frequent among woman than among men, and the break-down of the 

 thyroid coincides generally with a period of change or stress in the female 

 reproductive system. These charts show that a much closer relation exists be- 

 tween the reproductive system and the thyroid in the female than in the male. 



