io8 RESPIRATORY EXCHANGE OF ANIMALS AND MAN 



tot 



c.c. CO 2 in 24 hours. 



9 



8 



7O 



60 



5 



30 

 2 



40 

 300 

 9O 

 SO 

 70 

 60 

 SO 



CO 2 production. 

 Weight of embryo. 

 _ _. Weight of embryo and membranes. 



22Grasn 



2f 



20 



19 



18 



17 



16 



1* 



H 



13 



t2 



n 



10 

 9 

 8 

 7 

 6 

 -5 

 *t 

 3 

 2 



15 16 17 18 19 20 2l Days. 



-Changes in weight and respiratory exchange during embryonic development. 

 From " Skand. Arch. Physiol." 



