42 K Uptake by Tissues in Pregnant Animals 153 



extreme figures were associated with a correspondingly de- 

 creased or increased potassium content. There is thus no 

 evidence that the uptake of radio-potassium per g. of placen- 

 tome 15 minutes after injection varies during pregnancy. 



Table III 



The Activity of Tissues in the Pregnant Goat 15 Minutes 

 after Intravenous Injection of 42 KC1 



1 Activity determined as shown in footnote to Table I. 



2 Potassium content expressed as mg. of K per g. of wet tissue. 



The membranous chorion was rich in potassium, but the 

 quantity present was usually less than that in the placentome 

 (per g. of wet tissue). The radioactivity of the membranous 

 chorion was less than that of the placentome, except in Goat 

 14, where it was slightly higher. The activity of the mem- 

 branous chorion per g. was • 0004 per cent at the 35th day, 



