]26 



ANATOMY 



These determinations show that with increasing body weight, 

 within each sex, the glandular lobe increases more rapidly than 

 the nervous. As between the sexes the glandular lobe in the 

 female is relatively larger than in the male. 



Suprarenals. From the studies of J. C. Donaldson ('19) it 

 appears that the left suprarenal is usually distinctly heavier 

 than the right. The volume of the medulla relative to that of 



BODY WEIGHT 

 GRAMS 



;-- ?GO 150 200 250 300 



Chart 14 The change in volume of the medulla expressed as a percentage of 

 the whole adrenal gland. Dots, , males, individual values. Crosses, +, fe- 

 males, individual values. 



the entire gland decreases rapidly from birth to 50-100 grams 

 of body weight, after which it increases in the male, but remains 

 constant in the female chart 14. 



The greater weight of the suprarenals in the female is there- 

 fore due mainly to the greater weight of the cortex. 



Thymus. See tables 151 and 152. 



Thyroids and parathyroids. See table 148. 



Pancreas : Islets of Langerhans. See table 88 a. 



A careful study of the number of islets of Langerhans in the 

 pancreas has been made by M. D. Overholser (MS. '24). The 



