EMBRYONAL IRON TURNOVER 



659 



is compared in Fig. 3, while Fig. 4 demonstrates the ratio of ^^Fe uptake 

 by 1 gm of foetal and 1 gm of maternal liver, this ratio reaching a maxi- 

 mum figure of 204 and having a mean value of 143. 



The ratio of the mean specific activity of the maternal liver ferritin 

 iron and total liver iron was found to be 1.2, that of the corresponding 

 ligure for the embryo 1.0. In view of the fact that the blood content of 

 the liver cannot be fully removed, no conclusion can be drawn from 

 the above difference. 



10 ~ 



5 - 



Di 



%'\0' 



4 - 



n 



^ o 



C Q- 



O X 



D I 



Fig. 6. Percentage of the 

 activity of 1 /^gm maternal 

 hemoglobin in the total ma- 

 ternal activity at the end of 

 the experiment X 10*. 



Fig. 7. Percentage of the 

 activity of 1 //gm embryonal 

 circulating hemoglobin in 

 the total embryonal activity 

 at the end of the experi- 

 ment X 102. 



%xio 

 6H 



-z 



4- 



DI 



71 „ 



Fig. 8. The activity of 1 //gm embryonal nuclear hemoglobin Fe in 

 percent of the total embryonal activity lO^. 



42* 



