Effects of Oxygen on Dove Embryos. 105 



TABLE II. 



Showing the Relation of Age of Embryo to Survival under Altered 

 Oxygen Pressures. 



Exp. No. 29, 24 Hours, 



Exp. Xo. X, 240 Hours, 



Exp. No. 40, 72 Hours, Exp. No. 39, 24 



Hours, 



O, = 9 5.o%. 



Oi = 5 o.i%. 





= 12.6%. 



0, 



= 12.4%. 



Age 



of Em- 



Killed. 



Sur- 



Age 

 of Em- 



Killed. 



Sur- 



Ape 



of Em- 



Killed. 



Sur- 



Acre 



AgC 



of Em- 



Killed. 



Sur- 



bryos. 



vived. 



bryos. 



vived. 



bryos. 





vived. 



bryos. 



vived. 



9-0 





+ 



5.0 





+ 



5-5 



+ 





10. 0 





+ 



7.2 





+ 



4-5 





+ 



5-0 



+ 





9-5 



+ 





6-5 



+ 





3-2 





+ 



4-5 



+ 





9.0 



+ 





6.2 





+ 



25 



+ 





4.2 



+ 





8.2 1 



+ 





5-2 



+ 





2-5 





+ 



4.0 



+ 





4-5 



+ 





5-0 





+ 



2.2 





+ 



3-2 



+ 





4-2 



+ 





4-5 



+ 





2.0 





+ 



2-5 



+ 





3-5 





+ 



4.2 



+ 





1.2 





+ 



2-5 



+ 





3-2 





+ 



4.0 



+ 





1.2 





+ 



1.2 





+ 



3-2 



+ 





3-5 



+ 





1.0 



* 



* 



1.2 





+ 



3-0 



* 



* 



3-2 



+ 





0-5 



* 



* 



1.0 





+ 



2-5 





+ 



3-2 



* 



* 



0-5 







1.0 





+ 



2-5 







2-5 



* 



* 



0.5 



-i- 





0.0 





+ 



2.2 





+ 



2.2 



+ 





0.3 



+ 





0.0 



* 



* 



2.2 





+ 



i-5 



+ 





0.0 













2.0 





+ 



1.2 



+ 

















2.0 





+ 



1.0 



+ 

















1-5 





+ 



0.6 



+ 

















1.2 





+ 



0.6 



+ 

















1.2 





+ 



0.2 



+ 

















1.0 





+ 



0.2 



+ 

















0.2 





+ 



* Survived period in altered oxygen pressure but died immediately afterward. 

 1 Seven embryos aged 6.5 to 4.5 days, all killed, are omitted to save space in table. 



the two tables given here clearly indicate that it is not the sole 

 factor. A study of the complete data, one part of which has been 

 previously reported, 1 makes it probable that variations in the 

 permeability of the egg-shell to gases and the sex of the enclosed 

 embryo are such additional factors. 



1 Riddle, Oscar, Proceedings of the Society for Experimental Biology and Medicine, 

 1920, Xyiii, 88. 



