STl'DIES OX THI-; Min'AHOLIS.M OF PnOSPHORlS l.\ AM.MALS 



163 



and one of the Avrilers of this paper are at present engaged on an 

 investigation of the exehange of phosphorus in tho incisors on differ- 

 (Mil hnes. 



Tahi.k n 



UPTAKE OF PHOSPHORUS IN PREGNANT RATS AND IN HUMAN 



PLACENTA 



InTaljle 10 the result of the investigation of adult normal and pregnant 

 rats is seen. Those designated 1 were killed after a lapse of one week, 

 those marked II after two weeks. 



As can be seen from the above figures the different organs of the preg- 

 nant rats took up less rad. P than normal rats, the difference being 

 found at least partly in the foetus and placenta. In the first rat, which 

 was in an advanced stage of pregnancy, the foetus and still more the 

 placenta had a high content of rad. P, higher than any organ of the 

 mother. We find here again a very conspicuous illustration of the differ- 

 ence between the taking up of P through an exchange process and through 



Table 10 



ir 



