280 Society Proceedings (122). 



TABLE B. 



Determinations on American Residents at Cerro — 14,300 Feet. 



Subject. 



K. 



Dot. 





P 



7.86 



43-4 





McL 



9.76 



44.9 



All of these persons have lived two or more years 



Cu 



7.85 



44-7 



at high altitudes carrying on their work, free 



Co 



11-37 



4i-5 



from symptoms. 



R 



12.22 



65-3 





A further series on five acclimatized persons, none of whom 

 had ever suffered from seroche, all gave values for the diffusion 

 constant for oxygen (D02) above 40. 



122 (1869) 



An undescribed relation of the suprarenals to ovulation. 



By OSCAR RIDDLE. 



[From the Carnegie Station jor Experimental Evolution, Cold Spring 



Harbor, N. Y.] 



The observations described here make it extremely probable 

 that the suprarenal glands regularly and greatly enlarge in close 

 relation to the time of liberation of ova from the ovary. The 

 maximum size seems to be attained in the 44-hour interval between 

 the ovulation of the first and second ova — which together con- 

 stitute a definite period of ovarian activity in the pigeon. The 

 early stages of the suprarenal enlargement are coincident with 

 the 4 to 5 days of extremely rapid growth 1 which these ova 

 undergo immediately before their expulsion from the ovary. 

 Knowledge of the exact time (within an hour) of ovulation in 

 the pigeon has made this result possible. An enlargement of 

 the oviduct also occurs quite parallel with that of the suprarenals 

 (both facts shown by curves and tables). That an hypertrophy 

 of the suprarenals occurs in some sort of relation to the menstrua- 

 tion, pregnancy and lactation of mammals has of course been 

 described; so far as we are aware the nexus with ovulation has 

 been overlooked. 



1 Riddle. O., Amer. Jour. Physiol., 1916, xli, 387. 



